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Cake:
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Heat oven to 350°F Line 2 standard 12-cup cupcake tins with baking papers and set aside.
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Mix the cocoa, food coloring, and vanilla together in a small bowl and set aside.
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Beat the butter and sugar together in a large bowl, using a mixer set on medium-high speed. Add the yolks and beat for 1 more minute. Add the cocoa mixture and beat to combine.
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Stir the buttermilk and salt together and add it in thirds, alternating with the flour.
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Mix the baking soda with the vinegar and blend into the batter.
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Fill each cupcake tin with 3 tablespoons batter, and bake until a toothpick inserted in the cupcake center tests clean — about 15 minutes.
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Cool in the pans on a wire rack for 15 minutes.
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