In this video, you’ll see how to make tomato sauce for freezing. When life gives you tons of tomatoes, make spaghetti sauce! Lots of it. Tomatoes cook in the slow cooker with garlic, onions, and herbs. You can also make this recipe in a large pot on the stove. Watch the video, then get the 5-star recipe for Stephanie's Freezer Spaghetti Sauce. Freeze your sauce in quart-size jars for super-simple weeknight meals.