This garden-fresh tomato sauce is a delicious way to use summer-ripe tomatoes. Or freeze whole tomatoes and make this sauce later on in the winter. Just remove the cores and freeze them whole. Then, turn your frozen tomatoes into a garden-fresh sauce any time of the year. For pizza sauce: In Step 2, cook until thickened to about the consistency of pizza sauce, 1 1/2 to 2 hours. Remove from the heat, transfer to a blender, add 2 tablespoons tomato paste and blend until smooth.