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1
Preheat oven to 350 degrees F.
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2
In a stand mixer fitted with the paddle attachment, cream butter and sugar, until light and fluffy.
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3
Meanwhile, in a small bowl, make a paste out of the red food coloring, cocoa and salt.
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4
Remove bowl from stand mixer and mix in paste by hand to the creamed butter.
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5
In a measuring cup, stir eggs with buttermilk and add to batter.
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6
Mix in vinegar and vanilla, and then add flour and baking soda.
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7
Mix until combined but do not over mix.
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8
Butter a sheet pan.
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9
Lay parchment on top.
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10
Butter the parchment.
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11
Pour batter into pan and smooth the top to even the batter out, using an offset spatula.
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12
Bake cake until a toothpick comes out clean, about 30 minutes.
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13
Remove from oven and cool in pan.
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14
Meanwhile, make the frosting: Heat all ingredients in a medium saucepan.
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15
Whisk until sauce thickens, about 15 minutes.
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16
Let cool slightly before using.
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17
Invert cake onto a cutting board and slice into quarters from the longer side.
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18
To assemble cake, spread 1 of the quarters with some of the frosting to cover.
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19
Sprinkle with a quarter of the pecans.
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20
Add another layer of cake and repeat.
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21
Continue until last layer is added.
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22
Frost the top of that and sprinkle with remaining pecans.