Ingredients
- 1/2 medium red onion (about 4 ounces; 110g), thinly sliced
- 1/4 cup (60ml) red wine vinegar
- 20 ounces (560g) oil-packed tuna, preferably ventresca (see note), drained and flaked by hand into roughly 1/2-inch pieces
- 1 stalk celery (about 3 ounces; 85g), sliced thinly on the bias
- 1/4 medium bulb fennel (about 1 ounce), cored and thinly sliced
- Handful flat-leaf parsley leaves, roughly chopped
- 2 tablespoons (30ml) drained brined capers
- 1/4 cup (60ml) drained pitted briny black or green olives, quartered lengthwise
- 1/4 cup plus 2 tablespoons (90ml) extra-virgin olive oil, plus more as needed
- 2 tablespoons (30ml) fresh juice from 1 lemon
- 1/2 teaspoon (3ml) Asian fish sauce or very finely minced oil-packed anchovy fillets (about 2 small fillets)
- Kosher salt and freshly ground black pepper
- 8 slices rustic sandwich bread, such as a Pullman loaf, brushed with olive oil and toasted
- Arugula, for garnish
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