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How to decorate an ice cream cake
Freeze the cake for at least 3 hours before icing it.
You want your ice cream cake to stay together while you're icing and decorating it, which is why keeping it as frozen as possible is important.
Pick out a frosting that complements a frozen cake.
Most normal buttercream frostings will crack or break once they're frozen. A whipped cream topping is the best choice-it will stay nice and smooth after being used.