Instructions

Grate cucumber and place in a colander to drain for 10 minutes. Press out any remaining liquid with paper towels.
Stir together cucumber, yogurt, garlic, lemon juice, dill, and salt in a small bowl; set aside.
Preheat an outdoor grill for medium-high heat and lightly oil the grate.
Sprinkle Greek seasoning on both sides of burger patties.
Place patties on the preheated grill and cook for 4 minutes. Flip and grill for 4 more minutes. Place burgers on buns and top with lettuce, onion, tomato, olives, and reserved cucumber sauce.