3/4 cup low-fat cottage cheese
3 tablespoons olive oil, divided
2 tablespoons chopped flat-leaf parsley plus 1 cup leaves
2 tablespoons (or more) fresh lemon juice, divided
1 tablespoon coarsely chopped capers
1 scallion, thinly sliced
Kosher salt, freshly ground pepper
1 cup halved cherry tomatoes
1/4 cup quartered pitted mixed olives
4 ounces tuna packed in olive oil (preferably pole-caught), drained, broken into pieces
4 1/2-inch-thick slices rustic bread
1 garlic clove, halved
Combine eggs, cottage cheese, 1 Tbsp. oil, 2 Tbsp. chopped parsley, 1 Tbsp. lemon juice, capers, and scallion in a medium bowl. Using a potato masher or large fork, mash until a coarse paste forms. Season with salt and pepper.
Toss 2 Tbsp. oil, 1 cup parsley leaves, 1 Tbsp. lemon juice, tomatoes, and olives in a medium bowl. Season with salt, pepper, and more lemon juice, if desired. Gently fold in tuna (don't overmix; keep it chunky).
Toast bread; rub 1 side with cut end of garlic. Spread egg salad on top of each slice, dividing equally. Top with tuna mixture.