"This delicious cake recipe was adapted from "Martha Stewart's Baking Handbook."..."
INGREDIENTS
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24 ounces best-quality semisweet chocolate, finely chopped
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1/2 cup plus 1 tablespoon Dutch-process cocoa powder
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1/2 cup plus 1 tablespoon boiling water
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3 sticks (1 1/2 cups) unsalted butter, room temperature
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1/2 cup confectioners' sugar
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Pinch of salt
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Yellow Butter Cake
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Colored sprinkles (optional)