Greek Meatballs (Keftethes)

2 pounds ground lamb
1 egg, beaten
2 tablespoons mint leaves
1/2 teaspoon dill flakes
1 teaspoon vinegar
¾ cup fresh bread crumbs
6 cloves garlic, crushed
1 large onion, chopped
Salt and pepper, to taste

Mix all ingredients and form into walnut-size balls. Flour them lightly and brown in oil. 
Add to sauce. Simmer meatballs and sauce 20 minutes. Add water if needed. 

Sauce
2 (8 ounce) cans tomato sauce
1 onion, chopped
3/4 cup butter
1 teaspoon cinnamon
1/4 teaspoon cloves
1/4 teaspoon nutmeg
2 bay leaves