In a large skillet, cook the ground lamb or beef over medium heat until browned. Drain excess fat.
Add the chopped onions, carrots, and garlic to the pan and sauté until the vegetables are softened, about 5 minutes.
Stir in the tomato paste, Worcestershire sauce, thyme, rosemary, and season with salt and pepper. Cook for 2 minutes.
Sprinkle the flour over the meat mixture and stir to combine. Pour in the broth and bring to a simmer. Let the mixture thicken slightly, then add the peas. Cook for another few minutes until everything is well combined and slightly thickened.