Learn how to make Hollandaise Sauce the traditional way, with a whisk! It sounds intimidating, but with a little patience, anyone can do it, I promise.
Add egg yolks to bowl. Using a metal whisk or wire whip, whisk the yolks constantly without overcooking the yolks. You'll know the yolks have thickened enough when you can draw a line through the yolks and yolks stay put. The line does not fill in.
Adapted from "Hollandaise" in On Cooking.