Ingredients
- 1 medium red onion (about 8 ounces; 225g), cut into 1/4-inch dice
- 1/2 cup (120ml) red wine vinegar
- 4 (5-ounce; 140g) cans oil-packed tuna, drained
- 2 stalks celery (about 6 ounces; 170g total), cut into 1/4-inch dice
- 1 cup (240ml) mayonnaise, plus more as needed
- 1 ounce (about 10 stalks) flat-leaf parsley leaves and tender stems, minced (about 1/4 packed cup)
- 1/2 teaspoon (3g) Asian fish sauce or very finely minced oil-packed anchovy fillets (about 2 small fillets)
- Kosher salt and freshly ground black pepper
- 8 slices sandwich bread, very lightly toasted
- Romaine lettuce leaves, torn, for garnish
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