This is a seriously Easy Two Minute Hollandaise Sauce. This works like a charm and tastes just as good as the Classic version, without the hassle!
Add butter to a small heavy-bottomed saucepan, and melt on medium-low heat. You don't want to boil the butter, but bring it to a steamy heat.
Add the egg yolks, Dijon mustard, lemon juice, zest (if using) and a dash of hot sauce to a blender. Cover and blend for 10 seconds.
Set the blender on high speed, and pour the butter into the egg yolk mixture in a thin stream. It should thicken almost immediately. Keep the sauce warm until serving by placing the blender container in a pan of hot tap water.