Slicing the top, rounded portion off of a cake before frosting gives it a smoother, more professional look. To make removing that top crumbly layer even easier (not to mention smoothly frost the sides), just pop it in the freezer first. Photo by Tim Hoggarth.
This tip comes from Epicurious, and is just one of a whole slew of helpful tips on how to use your freezer to improve your cooking. (Click the link below to read the rest.) According associate food editor Kat Sacks, freezing your cake is the secret to easily removing the top uneven part without having to reach for a knife:
Once the cake is frozen, just let it thaw at room temp for just a few minutes, and you’ll find you can rub off the top crumbly part. What lies beneath: A smooth cake foundation for a gorgeous frosting job.
Once the crumbly part is rubbed off, you are free to frost. You’re also free to eat the crumbly part, which I recommend.
12 Freezer Hacks You Need to Know [Epicurious]