Slice the onion and peppers into rings, and cut the tomatoes into strips or small cubes.

Heat oil in a saucepan over medium heat. Once hot, add the onion, peppers, and tomatoes, and sauté for about 5 minutes.

Push the vegetable mixture to the side and add the ground beef with the seasonings. Cook for about 15 minutes, then mix in the sautéed vegetables and cook for another 5 minutes to blend the flavors.

Add salt to taste and serve.