Heat a large saucepan over medium-high heat, and melt the cooking fat.
4 tbsp. cooking fat
Brown the lamb pieces in the saucepan for about 1 minute per side, then set aside.
2 lb. lamb stew meat
Add carrots, onions, and garlic, and cook for a couple of minutes until the onions begin to soften.
3 to 4 carrots, 1 onion, 2 garlic cloves
Add the mushrooms, broccoli, and tomatoes, and pour in the beef stock; scrape the bottom of the saucepan while cooking.
1 broccoli head, 2 tomatoes, 8 oz. mushrooms, 2 cups beef stock
Sprinkle with fresh thyme, and season to taste.
1 tsp. fresh thyme, Sea salt and freshly ground black pepper
Bring the lamb back to the saucepan, lower the heat to medium, cover, and cook for 30 to 40 minutes.