Heat oil in a large skillet over medium high heat. Add 2 tablespoons onion and garlic to the pan; cook 1 minutes, stirring constantly. Cool slightly. Combine onion mixture, breadcrumbs and mint, add lamb, beef, 1/2 teaspoon salt, 1/4 teaspoon pepper and egg. Stir gently. Shape into 30 1-inch meatballs. If you have time, put them in the refrigerator of ran hour or so to firm up…this will make them easier to brown.
Heat pan to medium high with the remaining tablespoon of olive oil and add meatballs. Cook 4 minutes or so to brown them on all sides. Remove meatballs from pan. Add 1/2 cup onion and sauté for 2 minutes. Add ginger, cumin, cinnamon and crushed tomatoes and simmer of t5 minutes. Stir in the water, remaining 1/2 teaspoon salt and remaining 1/4 teaspoon pepper. Return meatballs to pan and simmer for 20 minutes or until done. Garnish with additional chopped fresh mint if desired.
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