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Preheat the oven to 350°F. Line two 12-cup muffin pans with cupcake papers.
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Mix the butter, oil, sugar, salt, color, and cake enhancer, beating until light and fluffy.
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Add the eggs one at a time, beating well and scraping the bottom and sides of the bowl after each addition.
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Sift together the flour, cocoa, and baking soda (and dried buttermilk, if you're using it).
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Alternately add the dry ingredients and the buttermilk to the creamed mixture, one third at a time, beating well after each addition.
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Spoon the batter into the prepared pans, and bake the cupcakes for about 18 to 21 minutes, until a toothpick inserted into the center of one of the middle cupcakes comes out clean.
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Remove the cupcakes from the oven, cool on a rack for 5 to 10 minutes, then turn it out of the pans to cool on the rack.
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To prepare the frosting, sift the ClearJel with the confectioners' or glazing sugar.
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Add the heavy cream, and start beating. When the cream reaches a soft peak, set the mixture aside.
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Beat the vanilla, lemon, and cream cheese together until fluffy.
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Whisk in 1/4 of the whipped cream mixture and stir until completely combined. Fold in the remaining whipped cream.
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Frost the cupcakes; refrigerate to set up the frosting. For best flavor and texture, bring the cakes to room temperature before serving.