Ingredients
- 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
- 1⁄2 small yellow onion, thinly sliced crosswise
- Kosher salt and freshly ground black pepper, to taste
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