Ingredient:

• 8 ounces uncooked spaghetti
• 2 tablespoons olive oil
• 1 small onion, chopped
• 2 cloves garlic, minced
• 1/4 to 1/2 teaspoon crushed red pepper flakes
• 6 plum tomatoes, seeded and chopped (about 4-1/2 cups)
• 15 fresh basil leaves, torn
• 1 teaspoon salt
• 1/4 teaspoon pepper
• 1/4 cup grated Parmesan cheese