Using the whip attachment on your mixer, whip the yolks on medium-high speed until thickened, about 3 minutes. Continue beating on medium high and gradually add 1/2 cup of the sugar, about 2 Tbs. at a time; beat for 20 to 30 seconds between additions. You may need to stop to scrape the bowl occasionally. Beat on high speed until very thick and pale, about another 3 minutes. When the whip is raised, the yolks should fall into the bowl and form a slowly dissolving ribbon. Beat in the vanilla. Scrape the mixture into a large, wide bowl. Wash and dry the mixing bowl and the whip.
Check the melted butter to be sure it’s tepid (about 95°F) and liquid. The butter must not be at room temperature or it won’t blend into the batter properly. If necessary, rewarm it briefly.
Drizzle half of the tepid butter on top of the batter and partially incorporate it quickly with three or four broad strokes, turning the bowl a little with each fold. Pour on the remaining butter and fold it in only until no butter shows. Carefully scrape the batter into the prepared pan (the pan will be about half full), spread it evenly, and put the pan in the oven immediately.
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