Briny sardines get added intensity from fresh onion and Dijon mustard in this open-face sandwich from chef and radio host Mike Colameco. This recipe first appeared in our April 2011 special Sandwich Issue with the article Forgotten Fish.
3 tbsp. Dijon mustard 2 slices rye bread, toasted 2 large leaves bibb lettuce 1 4-oz. can sardines in oil, drained, plus 2 tsp. reserved oil ½ small yellow onion, thinly sliced crosswise Kosher salt and freshly ground black pepper, to taste
1. Spread mustard evenly over each slice of bread and top with 1 lettuce leaf. Divide sardines evenly between sandwiches and top with onion.
2. Drizzle with reserved oil, and season with salt and pepper.