about 3 cups

How to Make It

Step 1

In an electric mixer bowl set over a saucepan of simmering water, whisk egg whites and sugar until sugar is nearly dissolved.

Step 2

Remove bowl from pan. Whip mixture at high speed until stiff. Reduce speed and beat until cool, 5 minutes. (Mixture must be cool before adding butter.)

Step 3

Add cold butter 1 piece at a time at mediumlow speed. Beat at high speed until fluffy. Add salt and vanilla and mix at low speed until well blended.

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