
1 cup egg whites (about 8 large egg whites, or use “Just Whites” egg white powder, reconstituted, or refrigerated egg whites)
1 ½ cups sugar
pinch of salt
2 cups unsalted butter (4 sticks), at room temperature**
2 tsp vanilla extract (or use small amounts of other flavored extracts)
Gel food coloring (for colored frosting)
In the top of a double boiler, stir together egg whites, sugar and salt. Bring water in bottom of double boiler to a low simmer; cook until the temperature of the egg whites reaches 160°F and sugar is completely dissolved (rub mixture between fingertips-it should not feel gritty). Mixture will be foamy and not a uniform consistency.
Transfer the egg white mixture to the bowl of a stand mixer. With the whisk attachment, whip until meringue is completely cooled and glossy peaks form, about 10 minutes. DO NOT ADD BUTTER UNTIL BOTH THE BOWL AND FROSTING ARE COMPLETELY COOL. Switch mixer attachment from the whisk to paddles. Add butter 1-2 Tablespoons at a time until incorporated. Mixture may appear curdled at times. Continue beating until butter is fully incorporated and frosting is fluffy and smooth. This will take about 10 minutes. Add vanilla and beat smooth. Add gel food coloring and beat until color is uniform.
**BUTTER NOTE: butter should be room temperature soft, but not at the point of melting. If the butter is too cold, it will not incorporate well into the meringue, and you will have butter chunks. If the butter is over-soft, it will cause the frosting to curdle while beating-this is okay, it isn’t ruined: it will just take longer (more beating) for the frosting to become smooth.
Storage: Store frosted cake at room temperature. To store leftover icing: store in a covered container in the refrigerator. When ready to use, bring to room temperature and beat until light and fluffy.
Yield: frosting for a two-layer round cake. For the cake above which is a double layer 11×15” rectangle, double the recipe.
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