Martha's Swiss Meringue Buttercream
Famous for its smooth, silky texture and a flavor that is not saccharine, Swiss meringue buttercream is perfect for desserts like layer cakes that need a lot of frosting and could run the risk of tasting too sweet. The finished buttercream will be stable—meaning it won't separate and turn grainy—and is easy to work with: it spreads over cakes like a dream, takes well to food coloring, and can be piped into all sorts of creative designs.
Martha Stewart Living, April 2020