Add tomatoes and cook for a minute, then return the beef to the pan and mix well.
Add the bay leaves and just enough stock to cover the beef by 1 cm and cover the pan. Simmer the meat gently for 40 - 50 mins. Do not let the mixture boil.
When done, strain the meat sauce and reserve the liquid.
Mashed Potato
Boil the potatoes in salted water until soft.
Mash the potatoes with the butter until well combined and there are no lumps. Feel free to use more butter and/ or milk to achieve a richer consistency.
Assembly
Spoon the meat mixture into a baking tray, making sure it is as level as possible.
Add a layer of mashed potato, making sure all the meat sauce is covered (especially in the corners).
Use a fork to fluff up the surface of the mashed potato. This helps form a nice crust and looks nice too.
Put the baking tray into the oven and bake for 45 minutes or until the mashed potato has turned golden brown.
Meanwhile, reheat the reserved liquid from the meat sauce, and allow to thicken into a gravy.
When ready, serve the Shepherd's Pie with the gravy.