Wash and core (stem) the tomatoes. Slice the tomatoes about ¼ inch thick and place on the dehydrator racks. I DO NOT PEEL them. I set the temperature at 155 degrees per my Excalibur Dehydrator instructions. Please check your dehydrator for correct temperatures. The time will always depend on the humidity where you are drying yours. You can use the dried tomato slices for making paste, puree or just to season what you are cooking. I dry them until they are a little flexible but not brittle. Today they took about 5 hours. These are great to use in soups, spaghetti sauces, or to eat as a snack!