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For the cake:.
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Preheat oven to 350 degrees.
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Place teaspoon of butter in each of 3 round 9-inch layer cake pans and place pans in oven for a few minutes until butter melts.
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Remove pans from oven, brush interior bottom and sides of each with butter and line bottoms with parchment.
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Whisk cake flour, cocoa and salt in a bowl.
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Place oil and sugar in bowl of an electric mixer and beat at medium speed until well-blended.
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Beat in eggs one at a time.
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With machine on low, very slowly add red food coloring.
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(Take care: it may splash.)
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Add vanilla.
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Add flour mixture alternately with buttermilk in two batches.
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Scrape down bowl and beat just long enough to combine.
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Place baking soda in a small dish, stir in vinegar and add to batter with machine running.
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Beat for 10 seconds.
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Divide batter among pans, place in oven and bake until a cake tester comes out clean, 40 to 45 minutes.
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Let cool in pans 20 minutes.
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Then remove from pans, flip layers over and peel off parchment.
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Cool completely before frosting.
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For the icing:.
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Softly whip cream by hand, in electric mixer or in food processor.
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Cover in bowl and refrigerate.
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Blend cream cheese and mascarpone in food processor or electric mixer until smooth.
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Add vanilla, pulse briefly, and add confectioners sugar.
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Blend well.
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Transfer cream cheese mixture to bowl; fold in whipped cream.
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Refrigerate until needed.