In a medium saucepan, heat vegetable oil over medium heat. Add garlic and cook for 1 minute. (If using garlic powder, omit oil and skip this step).
Add tomatoes, lemon juice, salt, pepper and red pepper flakes, if desired. Cook until heated through, stirring occasionally. For a thicker sauce, cook an extra 10 to 20 minutes to allow more of the liquid to evaporate.
Serve over pasta, or use in any recipe that calls for pasta sauce.
Refrigerate leftovers within 2 hours.
Try adding 1 teaspoon dried oregano, basil, or Italian seasoning.