A tsunami cake, also known as a pull-me-up cake, is a cake with most of its frosting suspended inside of a thin, acetate cake collar. The cake collar is wrapped around the outside of the cake, and the frosting is poured into the center of the cake. The result is a cake with a waterfall of frosting that cascades down the sides when the collar is removed. Tsunami cakes became popular in 2021 when the cake trend went viral on TikTok. They are a visually stunning dessert that can be made in a variety of flavors and styles.