Ruth Alexander explores the art and etiquette of tipping and how it varies around the world.

She hears from staff and customers in countries where tipping is essential and in places where it can be taken as an insult.

Ruth also talks to servers and bartenders about what your gratuity means to them and how tipping can sometimes bring out the best and worst in their customers.

Producer: Lexy O’Connor and Rumella Dasgupta

Sound mixing: Hal Haines

Image: A jar full of coins and notes has the word “tips” written on it. It floats on a red background. Credit: Nikola Stojadinovic / Getty

What are the highs and lows of waiting on tables? Ruth Alexander speaks to restaurateurs from London, New York and Mumbai to find out about the inner workings of one of the hardest jobs in the business.

Ruth hears from French celebrity Maitre D, Fred Siriex, Mumbai based restaurateur Gauri Devidayal and Michael Cecchi-Azzolina, the New York based author of Your Table Is Ready.

Image: The torso of a waitress, carrying two plates of food, against a purple background. Credit: Maria Korneeva/Getty Images)

From pizza delivery to emergency aid, are autonomous aircraft the future?

Ruth Alexander looks into whether drones are a feasible alternative to delivery drivers and traditional air drops.

We hear how fast food and groceries are being delivered into suburban back gardens in Helsinki and Dublin and to a waterside collection point in Hong Kong. Is this technology something we might see everywhere soon? Ruth looks at its advantages and limitations and finds out how drones are carrying essential food to remote communities in Madagascar.

Taking part were Danny Vincent, BBC Hong Kong reporter, Ville Lepalä, the CEO and co-founder of Huuva foodhall, Bobby Healy, the CEO of Manna Aero, Santanu Chakraborty, chief executive officer of Bal Raksha Bharat – Save the Children India and Hedley Tah from the United Nations Humanitarian Air Service, which is run by the World Food programme.

Produced by Rumella Dasgupta.

Image: A drone is flying against a stylised blue sky background. It is holding a white box which says Food Delivery on it in black letters. (Credit Getty Images/ sarawuth702)

Turmeric has been revered for thousands of years, not just for its mellow taste but for its golden colour and its supposed health giving properties.

Rumella Dasgupta looks at its history, its uses in food and medicine and talks to scientists who have studied the spice. She finds out what they've learned about its fabled medicinal qualities and whether it's really worth paying for expensive turmeric lattes and turmeric supplements.

Featuring Dr Kathryn Nelson, Prof Amit Garg, Ragini Kayshap and Seema and Sarla Nagpaul.

If you would like to get in touch with the show, please email [email protected]

Producer: Lexy O'Connor

(Image: a teaspoon of golden turmeric powder sits on a spoon, against a bright green background. Credit: G/ Getty Simonkr)

You've got to be full of passion to make it as a top chef. It's a highly skilled and physically demanding job that comes with long hours.

Ruth Alexander talks to three celebrated and talented chefs from three different continents about the highs and lows of their careers. They tell Ruth why they love the job so much and whether chef culture has changed in the years they've been working in kitchens.

Featuring May Chow, Chantel Dartnall and Sean Kenworthy.

For millions of us around the world, the day hasn't begun until we've had our first cup of coffee.

Ruth Alexander traces our love affair with coffee back through history, to the wilds of Ethiopia where it was first discovered. She experiences some of the ancient traditions built around coffee which still endure today and asks why this bitter drink has always had such a hold over us.

And does it matter if we enjoy a coffee or three every day? Ruth finds out what's it doing to our brains and bodies, and whether we really need to worry about kicking this ancient habit.

Produced by Lexy O'Connor

If you would like to get in touch with the show, please email: [email protected]

Image: Three roasted coffee beans float on a light green background. Credit: Getty/Jose A. Bernat Bacete

Pepper is ubiquitous at the dining table, but arguably most of us don’t know much about it.

In this programme John Laurenson finds out about the pepper plant – how it is grown and harvested and the range of flavours it can offer. He learns about the history of this spice and why it was once so revered, and the ways in which you can use it today to make your food not just tastier, but also healthier.

If you’d like to contact the programme you can email [email protected].

Produced and presented by John Laurenson.

Image: a cartoon wooden pepper mill with specks of ground pepper coming out of it, floats on a blue background. (Credit: Getty/yurumarukko)

How confident would you feel about complaining if a restaurant meal was not up to scratch?

Restaurateurs in the UK, South Africa and the United States compare stories of the most outrageous complaints they’ve received, and how they were dealt with.

They tell Ruth Alexander how increasing numbers of customers are "weaponising" the threat of negative online reviews.

And if you’re someone who struggles to complain when things go wrong, there’s advice on how to make your voice heard calmly and assertively.

If you would like to get in touch with the show, please email: [email protected]

Produced by Lexy O'Connor

Image: A young woman is arguing with a waiter in a cafe. She has a pastry on her plate and is holding a cup of coffee. Credit: Getty/Wavebreak Media

How much food is the “right” amount - and why is it so hard to work that out?

Ruth Alexander explores the world of portion sizes, starting with the rise of “portion distortion” in the United States, where supersized sodas and giant restaurant plates became the norm. Nutritionist Lisa Young explains how this shift happened, and what it’s meant for public health.

In São Paulo, dietitian Marle Alvarenga shares new research comparing Brazil, France, and the US, revealing how culture and globalisation shape what feels like a normal portion. Why are French plates so much smaller - and meals so much slower - than in Brazil or America?

And psychologist Lenny Vartanian in Sydney explains the powerful pull of portion size on our behaviour: why bigger servings make us eat more, even when we know better, and why education alone isn’t enough to change our habits.

If you would like to get in touch with the show, please email: [email protected]

Producer: Izzy Greenfield

Photo: Three spoons showing different portion sizes (credit: getty)

Listeners to BBC World Service told us they hate it when fellow diners chew noisily or talk with their mouth full. But what is polite at mealtimes can vary wildly according to where in the world you are and who you are with.

Ruth Alexander visits London's City of Westminster College to meet some of its teenage students, to find out about their different backgrounds and what good manners mean to them. She visits an exclusive private members club in the heart of London's West end to talk to Rupert Wesson, a director and coach at the British etiquette institution Debrett’s. And she hears from Japanese language tutor Chika Nakagawa about the rules that govern mealtimes in Japan.

Plus what if you are thrown into a world you weren't prepared for? After tough beginnings and through sheer determination Reggie Nelson built a career in finance. He tells Ruth about his extraordinary path to success and how he got through his first formal business dinner.

And what about when a restaurant meal brings out the worst in a customer? Mo Abedin, owner of Sticky Rice Thai restaurants in Dubai and Abu Dhabi talks about how he and his staff deal with the nightmare diners who have forgotten their manners.

Producer: Lexy O'Connor

(Image: A bearded man in a shirt and tie is eating a meal in front of a red background. He is shovelling a big fork full of noodles into his mouth whilst staring at his mobile phone. Credit: Getty Images/Group4 Studio)