Heat oven to 375 degrees F.
Mix lamb, crumbs, garlic, onion, vinegar, oregano, mint, salt, pepper and egg in bowl. Form into 2-inch balls (about 32). Place on 2 ungreased rimmed baking sheets.
Bake in 375 degree F oven 14 minutes. Remove from oven. Increase to broil.
Broil until cooked through, 3 minutes per pan. Transfer to platter. Serve with Tzatziki. Makes 8 servings.
If lamb is unavailable, use meat loaf mix or ground beef.