Boiled frosting, also known as seven-minute frosting, is a classic, cloud-like icing that has topped cakes and cupcakes for generations. Its light, marshmallowy texture and glossy finish make it a nostalgic favorite, perfect for those seeking a less-sweet, egg-white-based alternative to buttercream. This recipe shows you how to achieve perfect boiled frosting every time, with tips for success and creative variations.
Ingredients
- 3 large egg whites, at room temperature
- 1 cup (200g) granulated sugar
- 1/4 cup (60ml) water
- 1/4 teaspoon cream of tartar
- 1/8 teaspoon fine salt
- 1 teaspoon pure vanilla extract
Instructions
- Prepare your tools: You’ll need a heatproof bowl (preferably stainless steel or glass), a saucepan, and an electric hand mixer or stand mixer with a whisk attachment. Make sure your bowl and beaters are completely clean and free of grease for the egg whites to whip properly.
- Set up the double boiler: Fill a medium saucepan with about 2 inches of water and bring to a simmer over medium heat. Place the heatproof bowl over the saucepan, ensuring the bottom of the bowl does not touch the water.
- Combine ingredients: In the bowl, add the egg whites, sugar, water, cream of tartar, and salt. Whisk by hand just until combined.
- Heat and beat: With the bowl still over the simmering water, beat the mixture on high speed with an electric mixer for 6-7 minutes. The mixture will become thick, glossy, and form stiff, billowy peaks. The sugar should dissolve completely—rub a little between your fingers to check for grittiness. If it feels smooth, you’re ready to move on.
- Remove from heat and finish: Take the bowl off the saucepan. Add the vanilla extract. Continue beating on high speed for another 1-2 minutes, until the frosting is very thick, holds stiff peaks, and is slightly cooled.
- Use immediately: Spread the frosting onto your cake or cupcakes while it’s still fresh and fluffy. Boiled frosting sets quickly and is best used right away.
Tips
- Egg safety: Use pasteurized eggs if serving to young children, pregnant people, or anyone with a compromised immune system, as the egg whites are not cooked to high heat.
- Substitute for cream of tartar: If you don’t have cream of tartar, use 1/2 teaspoon of lemon juice or white vinegar to help stabilize the egg whites.
- Check for sugar crystals: Undissolved sugar can make the frosting grainy. Always rub a bit between your fingers to check for smoothness before removing from heat.
- Don’t overbeat: Once the frosting is thick and glossy with stiff peaks, stop beating to avoid it becoming dry or clumpy.
Serving Suggestions
- Classic cakes: Spread generously over chocolate, yellow, or angel food cake for a retro touch.
- Cupcakes: Pipe or swirl onto cupcakes for a pretty, meringue-like finish. Use a star tip for dramatic swirls.
- Sheet cakes: Boiled frosting is ideal for sheet cakes, as its lightness offsets denser cakes beautifully.
- Decorative peaks: Use the back of a spoon to make swoops and peaks that hold their shape and look striking.
Variations
- Lemon or orange: Add 1 teaspoon finely grated citrus zest and substitute half the water with citrus juice for a tangy twist.
- Coconut: Fold in 1/2 cup sweetened shredded coconut after beating for a tropical finish. Sprinkle extra on top for garnish.
- Chocolate: Sift in 2 tablespoons unsweetened cocoa powder with the sugar for a chocolaty marshmallow effect.
- Almond or peppermint: Substitute half or all of the vanilla extract with almond or peppermint extract for a distinct flavor.
Storage and Reheating
Boiled frosting is best enjoyed the day it’s made, as it tends to lose its fluffy texture over time. If you have leftovers, cover the cake or cupcakes loosely with plastic wrap and store at room temperature for up to 24 hours. In humid conditions, it may become sticky or weep slightly. Refrigeration is not recommended, as it can make the frosting stiff and chewy. Boiled frosting does not reheat well and is not suitable for freezing. For best results, make just enough to use immediately.
Frequently Asked Questions
- Can I make boiled frosting in advance?
- No, boiled frosting is best used immediately after preparing. It starts to set and lose its volume within a few hours, so plan to frost your cake or cupcakes right away for the best texture and appearance.
- Why is my boiled frosting runny or not holding peaks?
- This usually happens if the egg whites were not beaten long enough, the mixture didn’t get hot enough, or if there was any fat (like yolk or grease) in the bowl. Make sure your bowl and beaters are spotless, use room temperature egg whites, and beat over simmering water until stiff peaks form.
- Can I color boiled frosting?
- Yes, you can tint boiled frosting with gel food coloring. Add a small amount after removing from the heat, and beat until the color is evenly distributed. Avoid liquid food coloring, as it can thin the texture.
- Does boiled frosting harden?
- Boiled frosting develops a soft, slightly crisp outer layer as it sets, but remains fluffy inside. It is not as hard or crunchy as royal icing or meringue cookies, but it will hold its shape well on cakes and cupcakes for several hours.
- Is boiled frosting the same as Italian meringue?
- No. While both use egg whites and sugar, Italian meringue involves pouring hot sugar syrup into whipped egg whites, whereas boiled frosting is made by beating all the ingredients together over simmering water. The resulting textures are similar, but Italian meringue is more stable and less prone to weeping.
- Can I toast boiled frosting like marshmallow?
- Yes! For a toasted marshmallow effect, use a kitchen torch to gently brown the peaks after frosting your cake or cupcakes. Do this right before serving for best results.