Prepare tzatziki: In a bowl, combine Greek yogurt, grated cucumber, garlic, lemon juice, olive oil, salt, and pepper. Stir and refrigerate.
Mix meatballs: Combine ground lamb, almond flour, egg, parsley, mint, oregano, garlic, salt, and pepper. Mix gently.
Shape: Roll mixture into 12 small meatballs.
Cook: Heat olive oil in a skillet over medium heat. Add meatballs and cook 8–10 minutes, turning occasionally, until browned and cooked through.
Serve: Plate meatballs with tzatziki, cucumber slices, olives, and lemon wedges.