Have you ever wondered what EXACTLY is a Groom’s Cake? Groom’s Cakes are part fun, part tradition, and something chosen to express the groom’s personality or hobby, and therefore, you have a huge allowance to be as creative as you want! The groom’s cake can serve many purposes, from dessert at the rehearsal dinner to an alternative choice to the bride’s cake at the wedding. It’s customary for the groom’s cake to be displayed next to the wedding cake.