This is a savory burger that has a Greek sauce to give it a Mediterranean flavor.
In a small bowl, mix together cucumber, garlic, yogurt, and lemon juice; set yogurt sauce aside. Form lamb into about a 1/2-inch-thick patty. Sprinkle both sides with coriander and season with salt and pepper.
In a small skillet, heat oil over medium-high. Add lamb patty to skillet and cook 3 minutes. Flip and cook just until cooked through (a little pink in the center is fine), 2 to 3 minutes. Transfer patty to bun and top with yogurt sauce.
Ground beef or pork are other great options for this burger, instead of lamb.