Square & Rectangle Cake Frosting
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Square Chilling & Whittling
As soon as the frosting is hard, use the bench scraper to smooth out the sides of the cake. Alternate between swiping sideways and swiping upwards on each side of the cake to sharpen up the edges and corners.
Once the sides look relatively clean, proceed by leveling off the top lip with a medium offset spatula. Do not use the bench scraper on the top of the cake.
Achieving a perfectly squared cake often requires a couple of extra rounds of perfecting with the buttercream, adding a little more than enough, returning the cake to the refrigerator to chill, and later scraping away the finish so that crisp and straight sides remain. If you are aiming to achieve perfectly sharp corners, it might require 3-5 extra turns of chilling and whittling before the cake comes out looking just right.
To make sure a squared cake is level, hold a ruler next to each corner and measure to make sure they are all the same height.
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