Read the recipe for homemade tomato sauce.whole red tomatoesgarlicoreganosaltPlace the whole tomatoes on a pan lined with tin foil, and bake for 15 minutes. Next, remove the tomatoes from the oven, and let them cool to room temperature. Then put the tomatoes in a blender with the garlic, oregano, and salt. Finally, mix the ingredients in the blender at a low speed until the sauce is smooth.