Traditionally, it was always suggested that tomatoes should be peeled before being added to hot dishes for the sake of appearance in the finished dish. Of course, not everyone had a blender in their kitchen either! However, when the dish is being blended, I really don't think this matters, as no one will notice. If you prefer to skin the tomatoes, it's really easy to do. Put a small cross on the skin at the base of the tomato and place in a large bowl. Pour over boiling water from the kettle and leave for a minute. Next, place the tomatoes in another bowl filled with icy and water for a few minutes. This will stop the cooking process and stop the tomatoes from becoming mushy. Remove the tomatoes and set on a board. The skins should come off easily with your fingers. I prefer to use a small vegetable knife to peel the skin off. Procees with the recipe as normal.