Oh yes, only butter for me too, I can't stand margarine. I can't drink black coffee though. Gotta have some cream and a sweetener.yes, always black im, couldn't handle milk or sugar with it, that tasted nasty to me. i didn't have any trouble with butter tho cause i love, love, love butter, never ate margarine, couldn't handle that nasty tasting stuff even when they told everyone that butter was bad for you, nope, butter only for me, that might be why i love it in the coffee
sometime i crave the keto coffee, lifts me up and gives me energy