Square & Rectangle Cake Frosting
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The Squared Crumb Coat
Crumb coating a square or rectangle cake takes a bit longer than a round cylinder cake. This is a stage when the speed tip may present a more efficient option. Begin by heaping buttercream on top of the cake. Using a medium offset spatula, push the frosting out to the sides so that it hangs evenly over all the edges. Then work it all the way down each side.
Once the entire surface of the cake is covered, switch to the bench scraper, pulling it along each side so that the frosting hugs the cake closely. This will cause a lip to form around the top edge of the cake. Switch back to the medium offset spatula to clean off that lip.
Chill the cake for at least 10 minutes or until the crumb coat is hard.
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