Preparing the Meat Filling: – Sauté the Onions and Meat: In a large skillet, sauté finely chopped onions until they turn translucent. Add the ground lamb or beef and cook until browned, breaking it up with a spatula as it cooks. – Add Veggies and Flavor: Stir in diced carrots and peas. Add Worcestershire sauce, tomato paste, fresh thyme leaves, and season with salt and pepper. Cook for a few minutes until the vegetables begin to soften. – Create a Rich Base: Pour in beef or vegetable broth to create a flavorful base for the filling. Simmer for about 10-15 minutes, allowing the mixture to thicken and the flavors to meld together. Adjust seasoning if needed.