1. Preheat broiler. 2. Peel and grate 1 cucumber, then squeeze it to remove excess water. Stir in yogurt, 1/2 teaspoon lemon juice, one third of garlic, and 1/4 teaspoon each of salt and pepper to make tsatsiki. 3. Cut remaining cucumber into 1/4-inch pieces and stir together with tomatoes, feta (if using), onion, parsley, mint, remaining 1/2 teaspoon lemon juice, and 1/4 teaspoon each of salt and pepper to make salsa. 4. Gently simmer oil, oregano, rosemary, remaining garlic, 1/4 teaspoon salt, and 1/8 teaspoon pepper in a small heavy saucepan, stirring constantly, until garlic is fragrant but not browned, 1 to 2 minutes. Toss chicken with 3 tablespoons garlic oil and brush one side of bread with remainder. 5. Heat bread, oiled side up, in a 4-sided sheet pan, covered with foil, 3 to 4 inches from broiler 3 minutes. Uncover and broil, rotating bread for even coloring, until golden in spots, about 2 minutes. 6. Spread some of tsatsiki on warm bread and top with chicken and some of lettuce and salsa. Serve remaining lettuce, salsa, and tsatsiki on the side. 7. Cooks' note: Tsatsiki can be made 1 day ahead and chilled. ---------------------------------------------------------------------------
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