Combine the 4 egg yolks, 1 teaspoon Dijon mustard and 1 tablespoon fresh lemon juice in a blender. Cover, and blend on high for 1-2 minutes. The mixture will blend and start to lighten.
Reduce the blender speed and take out the middle stopped in the center of the lid. Slowly pour in the melted ½ cup unsalted butter in a steady stream while the blender is running.
Scrape down the side and continue to mix until sauce has thickened, approximately 1 minute.
Add the 1/4 teaspoon fine sea salt and optional ¼ teaspoon hot sauce or 1/4 teaspoon ground white pepper, pulse to blend.
The sauce will be semi-warm from agitation in the blender, but you can heat further by setting the whole blender in large bowl of hot water or place sauce in a double boiler sauce pan on low heat, stirring constantly.
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Notes
Storage: Store leftover hollandaise in an airtight container in the refrigerator for up to 1 day. Because it contains egg yolks and butter, it is best the day it is made.To rewarm, use very gentle heat. A bowl set over warm water works better than a microwave, which can overheat the sauce too quickly and cause separation.Freezing: I don’t suggest freezing hollandaise sauce since it does use raw eggs and is an emulsion. It will separate and be yucky when thawed with a much higher change of having related food illness.