Leave meringue in a mixer fitted with a paddle attachment. Add butter, 2 tablespoons at a time, on low speed, mixing after each addition. Beat until smooth, about 3 minutes.
Buttercream will keep, covered and refrigerated, for up to 3 days. Bring to room temperature, then beat on low speed before using.
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No recipe showing......says "Stub",
You need to make the basic swiss meringue first, then add the butter. Click on Basic swiss meringue for the recipe.
This buttercream icing only calls for butter.... Yuck!