Cut off the green leaves from leeks. Wash and cut leeks diagonally into 1-inch thick slices.
Sauté in a little oil and place in a baking pan.
Sauté onion and ground meat in remaining oil.
Add beef stock, tomato sauce, red pepper, salt and pepper, and bring to a boil.
Pour meat mixture over the sautéed leeks.
Bake for 1 hour at 375°F (190°C).
Serve hot.