Ripen the ice cream by transferring it to a freezer-safe container. This is the time to fold in cookies, candies, or sauces, such as caramel. Work quickly so the ice cream does not begin to thaw. And remember, less stirring is better, especially with the sauces. If you stir too long, the sauce will not ribbon or swirl through the ice cream. Once transferred to the freezer-safe container, let it stand in the freezer at least one hour or until firm.