To prepare a spaghetti sauce with ground beef recipe, you will first need to prepare your ingredients. Heat 2 tablespoons of olive oil over medium-high heat. Add 1 chopped onion and 2 chopped bell peppers and cook until softened, about 5 minutes. Stir in 1 tablespoon of chopped garlic and 1 teaspoon each of salt and pepper. Cook and stir until the garlic is fragrant, 1 minute. Pour in 2 cups of water and bring to boil. Reduce the heat to medium and simmer the sauce for 30 minutes, stirring occasionally.