Classic Spaghetti Carbonara

Ingredients

• 16 ounces macaroni
• 1 tablespoon vegetable oil
• 2 tablespoons butter
• 1 large onion (chopped, about 1 1/2 cups)
• 1 green bell pepper, chopped, optional
• 2 pounds ground beef
• 2 cloves garlic
• 1 teaspoon garlic powder
• 1 (28-ounce) can crushed tomatoes
• 1 (14.5-ounce) can diced tomatoes
• 1 (8-ounce) can tomato sauce
• 3 tablespoons tomato paste
• 1 teaspoon sugar
• 1/2 teaspoon ground black pepper
• Salt (to taste)