Buttercream: A classic icing that can be used as filling and finishing cakes. Most professional kitchens use a meringue-based buttercream, which gives it a silky texture. It is best enjoyed at room temperature due to the high butter content (since butter solidifies at cold temperatures). Buttercream is used to decorate cakes that have intricate piping detail. Thank you Tiffany of Peridot Sweets for the insight. Here's a sampling of some of her buttercream cakes!