Tuna Avocado Club

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2 (6-ounce) cans water-packed tuna, drained

1 Kirby cucumber, seeded and finely diced (3/4 cup)

3 tablespoons extra-virgin olive oil, plus a drizzle

3 tablespoons whole-grain mustard

2 scallions (white and green parts), thinly sliced

1 1/2 tablespoons chopped fresh dill leaves

1 1/2 teaspoons finely grated lemon zest from 1 lemon

Kosher salt

Freshly ground black pepper

8 slices nine-grain bread

1 Hass avocado, halved, seeded, and sliced

1 1/2 cup mesclun salad, or other lettuce

2 large tomatoes