I don't peel my tomatoes for this sauce. I roast the tomatoes in the oven on a baking sheet for 30-40 minutes before using them in this sauce. Roasting the tomatoes makes the peels softer. After I've cooked the sauce down I use my emersion blender to roughly puree the sauce. I like some chunks, but you can puree until the sauce is smooth if you prefer. This process can also be done in a blender. Tomato peels are full of carotenoids. Carotenoids are antioxidants that protect the body from cellular damage, aging and some chronic diseases. The peels also have flavonols which can support your circulatory system.