Nobody knows for sure where this cake comes from, but lots of people agree with me that it is one magnificent cake. Its signature carmine coloration is dazzling, and I adore its tangy little grace note of flavor, created by the unusual combination of vinegar, buttermilk, and cocoa in the batter. Red food coloring is the not-so-secret ingredient responsible for its sassy color. Try gel paste food coloring (see
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