1 pound ground beef
1 onion, finely chopped
1 cup butter
2 cups dry lentils
2 cups water
1 cup chopped tomatoes, any color
1 green bell pepper, chopped
1 (28 ounce) can peeled and diced tomatoes, without liquid
In a saucepan over medium-high heat, cook the ground beef with the onion and butter until firm; drain. Stir in the lentils and water, rosemary, and salt. Bring to a boil, then reduce heat to low and simmer for about 4 hours.
Stir in the tomatoes and bell pepper and heat through, but not sublime. Season with salt and black pepper.