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I made the Hollandaise with a typical recipe:
4 egg yolks
juice of a lemon
dash of cayenne
dash of salt
1/2 cup melted butter
I used the had blender and a 4 cup glass measure. Make sure the butter is steaming hot. Combine all and drizzle the hot butter while blending. I had a shallot so I chopped that up in there too. It was thick and rich and the perfect foil for the roasted asparagus.
Just so you know, I screwed this up a bit and made it before I looked up the recipe. I used 2 whole eggs and it was all a bit thin so I placed atop a double boiler, whisked it constantly and it quickly tightened up. Not sure if it tasted all that different. I am under the firm opinion that almost anything can be rescued. Don't try to reheat this in the microwave, does not work, live and learn.