Chocolate Frosting

This is the perfect chocolate frosting for cakes and cupcakes. 
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1 cube butter, softened
3-3 1/2 cups powdered sugar
4 Tbsp cocoa powder
1/8 tsp salt
1 tsp vanilla
2 Tbsp shortening for consistency
2-3 Tbsp ice water
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 Combine all ingredients while beating with a mixer.