Optional: Wash the meat and dry well with paper towel.
Mix together the salt and black pepper. Reserve 1 teaspoon for cooking the vegetables.
Season the lamb chunks with the remaining salt and pepper mixture.
In a large sauté pan, heat 2 tablespoons olive oil over medium heat.
Cook the lamb chunks in two batches. Turn up the heat to high once the meat is added. Cook each batch about 4 minutes per batch until meat is lightly brown. Transfer meat to a bowl. Turn down the heat to medium.
Saute the peppers and onions. Stir. Add garlic. Season with a pinch of the reserved salt and pepper. Stir and cook for 2 minutes.
Add the cinnamon, allspice and nutmeg. Stir and cook 30 to 60 seconds.
Add in tomatoes and season with the remaining salt and pepper. Add in sugar and cilantro. Turn up heat to high. Mix and cook 5 to 6 minutes until tomatoes starts to break down.
Add back the browned lamb. Add the chopped mint. Mix. Cover and lower heat to medium low or low. Simmer until fork tender and sauce thickens. About 1 1/2 to 2 hours.
Transfer to a serving bowl. Garnish with cilantro if preferred.
Serve and enjoy. I served this with my Creamy Sweet Peas Polenta. Link in notes below.