Swiss Meringue Buttercream Frosting
Note: In hot weather, use 2 lbs 10 ounces (1.19 kg) of butter and 6 ounces (710 g) of hi-ratio shortening. Hi-ratio shortening is emulsified and contains water.
Storage: Store the icing in an airtight container and freeze for up to 3 months.
Adapted from Epicurious | August 2004 by Toba Garrett The Well-Decorated Cake