Basic Hollandaise with Variations

Vigorously whisk, or beat with an electric mixer, the egg yolks and lemon juice together in a stainless steel bowl until the mixture is thickened. Place the bowl over a saucepan of barely simmering water (or use a double boiler - do not allow the water to touch the bottom of the bowl or pan). Continue to whisk rapidly, being careful not to let the mixture get too hot or the eggs will scramble. Slowly drizzle in the melted butter and continue to whisk until the sauce is thickened and doubled in volume. Remove from heat and season to taste with salt. Serve warm.