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The hot dog dates back to 13th century Frankfurt, where pork sausages were handed out to celebrate imperial coronations of the Holy Roman Empire. Vienna also claims it, through butcher Johann Georg Lahner's blend of pork and beef, which is where the name wiener comes from. This episode covers the competing stories of who first put the sausage in a bun: Charles Feltman's Coney Island cart in 1867, Harry M. Stevens at the Polo Grounds, and the Feuchtwanger family, whose customers kept walking off with the white gloves they lent out. We also explain the grim origin of the name, which newspapers used long before cartoonist Tad Dorgan supposedly coined it.

We look at what goes into a modern hot dog, including how nitrites keep it pink, the natural casings that give it a snap, and the Nojax cellulose casings invented in Chicago in 1925. We cover the argument over whether a hot dog is a sandwich, regional styles like the Chicago dog and the DC half smoke, 20 billion hot dogs eaten in the US each year, eating contest records, cancer research on processed meat, and choking risks for young children.

• Frankfurt vs Vienna and the origin of the frankfurter and wiener
• Three competing claims to inventing the hot dog bun
• Why hot dogs are called dogs and the Tad Dorgan myth
• Nitrites, natural casings and skinless hot dogs
• The sandwich debate, regional styles, health research and choking safety

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Tonkatsu started out as a Japanese take on the European cutlet. This episode follows the schnitzel, from the Middle High German word for slice to a dish found on nearly every continent. We explain why pounding meat thin makes it cook evenly, why Austrian law says a true Wiener Schnitzel must be made from veal, and why it is fried in clarified butter and never covered in sauce. Then we look at the neighbors who changed the rules: Italy's cotoletta alla Milanese, which may be older than the Viennese version, Germany's Jägerschnitzel and other sauce-covered schnitzels, the East German version made from sliced Jagdwurst, and the egg-battered Pariser schnitzel.

We continue with heavier northern European versions like Finland's Oscar's cutlet, Denmark's anchovy and caper garnish, and Teesside's parmo. We show how kosher laws turned Israeli schnitzel into chicken fried in oil and served in pita, and cover Iran's spicy version and German colonial influence in Namibia. Finally, we explain Japan's 1899 invention of tonkatsu with panko, its spread to Korea as donkkaseu, Latin American milanesa including milanesa napolitana, the Midwest pork tenderloin sandwich and Southern chicken fried steak.

• The thermodynamics of pounding, breading and frying a thin cutlet
• Austria's legal rules for a real Wiener Schnitzel
• European variations from Milan to Teesside
• How kosher law, migration and colonialism reshaped schnitzel in Israel, Iran and Namibia
• Tonkatsu, milanesa and chicken fried steak as global descendants

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In 1893 the US Supreme Court decided Nix v. Hedden, which asked whether the tomato is a fruit or a vegetable for tariff purposes. This episode traces how the tomato reached that point. Its wild ancestor, Solanum pimpinellifolium, grew in western South America and produced pea-sized berries. Mesoamerican farmers domesticated it, and the Aztecs grew many varieties. After Spanish conquest it spread through Europe, but John Gerard's 1597 book called it poisonous, and many in Britain kept it as an ornamental plant.

We explain the nightshade chemistry behind that fear, including tomatine and solanine in the leaves and green fruit, and the shift to lycopene and sugar as the fruit ripens. We cover buzz pollination by bumblebees, the uniform ripening mutation that cut sugar content and helps explain bland supermarket tomatoes, the failure of the Flavr Savr, and why umami made tomatoes central to cuisines worldwide. We finish with the court's reasoning and practical storage advice.

• How a pea-sized Andean berry was domesticated in Mesoamerica
• Why Northern Europeans once feared the tomato as poisonous
• Alkaloids, lycopene and the ripening strategy of the tomato plant
• Linkage drag, the uniform ripening mutation and the Flavr Savr
• The Nix v. Hedden ruling and why you shouldn't refrigerate tomatoes

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The hamburger's history reaches back to Hannah Glasse's 1758 recipe for Hamburg sausage served on toasted bread, and to the Hamburg steak that German sailors brought home from Baltic trade routes. This episode looks at the competing American claims from the 1880s and 1890s, including Charlie Nagreen, the Menches brothers, Louis Lassen and Oscar Weber Bilby, and argues that the burger was really a way to feed a workforce on the move. Fletcher Davis at the 1904 St. Louis World's Fair helped make it a national food.

After Upton Sinclair's The Jungle turned the public against ground beef, White Castle rebuilt trust in 1921 with spotless restaurants, grills in full view of customers, and slider patties with five holes that cook through without being flipped. The McDonald brothers pushed that model further in 1948. We then follow the burger around the world, from Australia's burger with the lot and India's vada pav to Danish gravy-covered burgers and East Asian rice burgers, and on to the Big Mac Index, the hundred dollar hamburger, luxury burgers and the $300,000 lab-grown patty unveiled in London in 2013.

• How the Hamburg steak turned into a handheld sandwich
• Rival claims to inventing the hamburger in the 1880s and 1890s
• How White Castle used open kitchens and five-hole sliders to win back trust
• Regional versions from Australia, India, Denmark and East Asia
• The Big Mac Index, fast food inflation and lab-grown meat

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In the trenches of World War I, Salvation Army volunteers Margaret Sheldon and Helen Purviance fried doughnuts for American soldiers, and the Salvation Army created National Donut Day in 1938 to honor that work. This episode follows fried dough from Cato the Elder's Roman globi to a 13th century Arabic recipe for sfenj, in which a ring of dough was fried first to test whether the yeast was ready. It continues with Dutch oliekoeken in New Amsterdam, Washington Irving's 1809 mention of doughnuts, and the disputed Hanson Gregory story, including his mother Elizabeth's habit of putting nuts in the center.

We cover the 1870 doughnut cutter, the 1920s Display Doughnut Machine Corporation push for the simpler spelling donut, and Dunkin' Donuts taking the name in 1950. We also compare the chemistry of cake and yeast doughnuts, and tour global versions like Japanese mochi doughnuts, Indian vada, Hanukkah sufganiyot, German Berliners and Polish paczki, ending with Dunkin' shops kept open for first responders during the Boston lockdown.

• Ancient origins of fried dough, from Roman globi to Arabic sfenj
• The Hanson Gregory legend and what historians actually support
• How 1920s marketing turned doughnut into donut
• Frying temperatures and oil absorption in cake versus yeast doughnuts
• Global fried dough traditions, from mochi doughnuts to paczki

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Tomatoes in Italy, chili peppers in India and potatoes in Ireland all arrived after 1492. This episode looks at the Columbian Exchange, a term historian Alfred W. Crosby coined in 1972 for the transfer of plants, animals, diseases and people between the Old World and the New World after Columbus's voyages. We explain how the potato drove an estimated 12 to 25 percent of population growth across Europe, Asia and Africa between 1700 and 1900, how cassava became Africa's key crop, why transplanted crops enjoyed a yield honeymoon away from their native pests, and how enslaved Africans supplied the expertise behind rice cultivation in the Americas.

We also cover the lopsided exchange of animals, which the sources connect to the east-west axis of Eurasia and the north-south axis of the Americas, and how the Plains Indians and the Mapuche took up the horse. Then we turn to the catastrophe: virgin soil epidemics that killed an estimated 80 to 95 percent of Indigenous people in the Americas, the debate over whether syphilis came from the New World, and how sugar plantations, malaria and the sickle cell trait shaped the transatlantic slave trade.

• How New World crops like the potato and cassava fueled population growth and urbanization
• Ecological release and the yield honeymoon of transplanted crops
• Why the Americas had so few domesticated animals and how Indigenous peoples adopted the horse
• Virgin soil epidemics and the evidence on the origins of syphilis
• How disease and sugar production drove the transatlantic slave trade

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The kiwifruit started out as a wild Chinese vine known by names like macaque peach, gathered by foragers and used in folk medicine. This episode follows it from Tang and Song dynasty records to New Zealand, where Hayward Wright developed the fuzzy green Hayward variety around 1924. It was sold as the Chinese gooseberry until the late 1950s, when a US importer warned that the name was a liability during the Cold War and that the word gooseberry was causing trouble with American customs, which associated gooseberries with anthrax in soil. In 1959 Jack Turner of Turners and Growers registered the name kiwifruit, after the nickname for New Zealanders rather than the bird.

We also explain why the fruit is so hard to farm. The vines have separate male and female plants, honeybees avoid the female flowers because they produce no nectar, growers flood orchards with hives or spray pollen by hand, and a 2020 genetic test can now tell a seedling's sex early. The story moves on to gold and red varieties, the PSA bacterial outbreak that wiped out New Zealand's Hort16A, the SunGold cuttings smuggled to China, and China's return as the top producer. We finish with actinidin, the enzyme that tenderizes meat, liquefies gelatin, and backs an EU-approved health claim about bowel function.

• How the Chinese gooseberry was renamed kiwifruit for the US market
• Why separate male and female plants and nectarless flowers make pollination difficult
• The PSA outbreak and the switch from Hort16A to SunGold
• Smuggled SunGold cuttings and how DNA testing is used to prove plant variety rights
• Actinidin's effects on meat, jello, allergies and digestion

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The word burrito means little donkey, and in an 1895 dictionary of Mexicanisms it was simply the Guanajuato word for a taco. This episode traces how that regional slang became a food of its own. We start with the tortilla-wrapped meals of the Maya and the Pueblo peoples, then weigh the folk stories: bedrolls on a donkey, Juan Mendez's street stand in Ciudad Juarez during the Mexican Revolution, and a Sonoran claim about vendors secretly selling donkey meat. Because wheat grows better than corn in northern Mexico, the original border burrito was a small, thin flour tortilla holding just one or two fillings, such as deshebrada.

We then follow the burrito into the United States: early menus at El Cholo in Los Angeles, Erna Fergusson's 1934 New Mexico cookbook, and Duane Roberts' frozen burritos in 1956. San Francisco's Mission District brought the oversized Super Burrito and the steam table assembly line that chains like Chipotle later spread everywhere. We compare San Diego's no-frills style and its French fry-filled California burrito with the chile-heavy Los Angeles tradition and fusion takes like Roy Choi's Kogi burrito.

• How the word burrito started as regional slang for a taco
• Competing folk stories behind the little donkey name
• Why northern Mexico's flour tortillas shaped the original minimalist burrito
• The Mission District's Super Burrito and steam table assembly line
• Regional rivalries, from the San Diego California burrito to LA fusion

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When South Korea sent its first astronaut, Yi So-yeon, to the International Space Station in 2008, scientists had to engineer a sterilized space kimchi that would not swell up from fermentation gases or be affected by cosmic radiation. This episode explains why the dish mattered that much. It began as a survival food on the Korean Peninsula more than a thousand years ago, when vegetables were packed into porous onggi pots buried in the ground to get through harsh winters. The early versions were not red or spicy. Chili peppers arrived through Portuguese trade and are first recorded in Korean texts in 1614, and Napa cabbage only came in the late 19th century.

We break down the microbiology of spontaneous fermentation, from the salt brine that suppresses harmful microbes to the handoff from Leuconostoc to Lactobacillus and Weissella. We compare the milder northern styles with the saltier, spicier, seafood-rich southern ones, and explain the communal gimjang tradition. The episode also covers the geopolitics: the 1996 kimuchi dispute with Japan, the Codex Alimentarius standard, the 2010 cabbage price crisis, South Korea's reliance on Chinese imports, the 2020 pao cai controversy, and separate UNESCO listings from both Koreas.

• How ancient Koreans used buried onggi pots to store kimchi through the seasons
• Why chili peppers and Napa cabbage are relatively recent additions
• The succession of lactic acid bacteria that gives kimchi its tang and fizz
• Regional differences between northern and southern kimchi and the role of fermented seafood
• Trade disputes, the 2010 cabbage crisis and the UNESCO heritage listings

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Tapas began as a literal cover. The word comes from the Spanish verb tapar, to cover, and this episode traces how a slice of cured ham laid over a glass of wine grew into a dining style known around the world. We go through the competing origin stories: King Alfonso X of Castile's royal decree requiring snacks with wine, King Alfonso XIII's windy visit to Cadiz, and the fruit fly theory popularized by Joy of Cooking, which also looks a lot like a clever way to sell more sherry.

From there we look at how innkeepers used pot covers topped with food samples as visual menus for travelers who couldn't read, and the darker theory that pork tapas served as a loyalty test for conversos during the Spanish Inquisition. We follow the ingredients from the Roman introduction of olive cultivation to the Columbian exchange that brought tomatoes, peppers and potatoes, and end with Valladolid's World Tapas Competition and small-plate traditions in other cultures.

• Why the word tapa means cover, and the practical problems it first solved
• Royal legends involving King Alfonso X and King Alfonso XIII
• The tavern economics of giving away salty ham and chorizo to sell more drinks
• How New World crops made dishes like patatas bravas possible
• Valladolid's World Tapas Competition and global equivalents like meze, sakana and cicchetti