Chicago-style hot dogs are a beloved culinary masterpiece: A snappy all-beef wiener, steamed poppy seed bun, yellow mustard, chopped onions, neon-green relish, two slices of tomato, a dill pickle spear, two sport peppers and a final whoosh of celery salt.

But how did that unique mix of ingredients come to be? In a special Curious City presentation, Chicago’s premier hot dog expert breaks down the history of each ingredient. It’s a tale of immigration to Chicago’s Maxwell street neighborhood a century ago. Click here for the full story.

Monica Eng is a WBEZ food and health reporter. Follow her at @monicaeng