In separate bowl from mixer, mix together almond flour, salt, baking powder, baking soda, sifted cocoa powder, xanthan gum, Swerve granulated. Set aside.
Beat eggs for five minutes.
Stream in oil.
Put sour cream in measuring cup. Fill with milk up to 1/2 cup mark. (I use Fairlife, which is low-carb. You can use heavy cream if desired). This makes a buttermilk.
Add food coloring to buttermilk mixture.
Add dry ingredients to mixer, alternating with buttermilk mixture.
Add vinegar at the end.
Bake immediately for 25 to 30 minutes at 325 degrees F.
Cool and frost with cream cheese frosting.