Hello rjohnson54. When you are processing a large quantity of tomatoes for a big batch of sauce, the most efficient and reliable method is blanching.
First, bring a large pot of water to a rolling boil and prepare a separate large bowl filled with cold water and ice cubes. Take your tomatoes and use a sharp paring knife to cut a shallow, shallow X on the bottom stem end of each one.
Working in batches so you do not overcrowd the pot, drop the tomatoes into the boiling water for about thirty to sixty seconds, just until you notice the skins starting to wrinkle and peel back around the cuts. Immediately use a slotted spoon to transfer them directly into the ice bath to stop the cooking process.
Once they are cool enough to handle, the skins should easily slip right off with just a gentle squeeze or a light push from your thumb. This method preserves the flesh of the tomato while saving you an immense amount of time.