Tomato hints Refrigerate tomatoes. Hold tomato firmly and scrape with a paring knife from the bottom to the top several times. Prick the skin with the point of the knife. The peeling will remove easily. Place thin-skinned tomatoes and fruits into a bowl, cover with boiling water and let set for one minute. Peel with a paring knife. Or, spear the fruit on a fork and hold over a gas flame until the skin cracks, then peel. Exposure to direct sunlight softens tomatoes instead of ripening them. Leave the tomatoes, stem-up, in any spot where they will be out of direct sunlight.