01 -
Whip the butter with shortening until they're smooth and fluffy.
02 -
Slowly add egg, buttermilk, vinegar, vanilla, and red coloring while mixing on low until everything's blended.
03 -
In another bowl, stir together flour, cocoa, salt, and confectioners' sugar.
04 -
Slowly add dry mix to wet stuff, stirring until just combined. Let the dough chill in fridge for an hour.
05 -
Drop tablespoon-sized balls on tray with 2-inch gaps. Cook at 350°F until done, about 12-14 minutes.
06 -
Dunk hot cookies first in melted butter, then roll in sugar. After they cool, give them another sugar roll.