The first step of removing the cake shelf is to close the edge. Use a spatula to make a 31-degree angle with the surface of the turntable, stick to the bottom edge of the cake, rotate the turntable, and slowly hold the spatula back to collect a circle of cream close to the surface of the turntable at the bottom of the cake. This way, when the cake is pried up later, the outside of the bottom edge will not be all burr-like. Step 2, scrape off: insert the spatula close to the surface of the turntable into the bottom of the cake, and then rotate the turntable once to scrape off the cream at the bottom of the cake.