I heard the recipe for Bulletproof Coffee a while ago, but I never got around to trying it.
*400-500 ml of high quality black coffee*2 tablespoons of Kerry Gold or other unsalted butter*A quick two shots of MCT oil*Put it all in a blender and blend it up
It's impressive stuff.
I've had it by itself for breakfast, and I felt lower hunger than normal while eating less to start the day, with no dip in cognition or thinking. I didn't get any mental clarity benefits as Asprey writes about, but I felt physically quite good.