When life gives you lemons, make lemon buttercream frosting! This zesty lemon frosting recipe is perfect for all lemon lovers with its creamy texture and sweet zip of citrus flavor. Lemon buttercream is one of those frostings that goes on almost any dessert. We especially like it in combination with pound cakes, classic vanilla layer cakes, and lemon cakes (of course!). Add this light and tart lemon frosting to any of your sweet treats, including cakes, cupcakes, and cookies.