Take six medium-sized rhubarb stalks, pare off the green parts, and peel them well. Then cut them into small pieces half an inch long; put them into a saucepan, on a very slow fire; cover, and let cook slowly for fifteen minutes; then remove, and add three ounces of powdered sugar; mix well for one minute, then transfer to another vessel, and set aside in a cool place for at least an hour and a half. Divide the rhubarb into six tarts, as for peach tarts (No. 1106); finish, and serve exactly the same.