What’s the story behind that little yellow can of hot sauce with a duck on the label? El Pato starts in Los Angeles. Angelenos have used the pantry staple of chile blend in tamales and enchiladas across generations. Founded in the early 1900s in Boyle Heights, El Pato also supplies In-N-Out Burger with mustard and McDonald’s with vinegar. Farley Elliott caught up with the current CEO in his piece for Eater LA.