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Attach bowl to mixer. Whisk on medium speed for 5
minutes. Increase speed to medium-high, and whisk
until stiff, glossy peaks form, about 6 minutes.
Reduce speed to medium, and add butter, 1 piece at
a time, whisking well after each addition. Whisk
in vanilla. Use immediately, or cover, and
refrigerate for up to 3 days. (Bring to room
temperature, and beat on low speed until smooth
before using.)
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