The tart, terrific taste of key lime flavors in a light and fluffy buttercream make this a new flavor of frosting that goes well on any tropical baked treat. Try it on banana cupcakes, key lime macarons, or coconut cake or cupcakes to add a little taste of vacation to all your desserts!
This frosting is similar to our traditional American buttercream and is great for piping decorations or frosting layer cakes.
Substitutions: Bottled key lime juice and regular lime zest may be substituted for the fresh key limes.
To store: Frosting should be stored in an airtight container in the refrigerator for 2 weeks and can be frozen for up to 6 weeks. Bring the frosting back to room temperature and re-whip before using.
To color: Use Icing Colors or food coloring to tint frosting to any color without disturbing the consistency of the frosting.
To cut sweetness: If your buttercream is too sweet, add a pinch of salt. Make sure it dissolves completely once mixed in. You can also opt for 1/2 cup salted butter rather than 1/2 cup unsalted butter to avoid overly sweet buttercream.
Whether you are frosting a cake or piping decorations, the consistency of the frosting is key to getting the right results. Too soft and your decorations will droop. Too stiff and your frosting will be difficult to spread.
Wondering how to take your cake to the next level? Up your frosting intensity with flavor! From traditional vanilla extract to gin or whiskey, this list of buttercream flavor add-ins makes it easy and fun to experiment in the kitchen.