In a narrow cup (wide enough to fit the head of an immersion blender), combine egg yolks, wine, lemon juice, and a pinch of salt
Hollandaise cannot be cooled and reheated
You can add other ingredients to flavor the hollandaise:
Add a 2 tsp reduction of red wine vinegar and tarragon to make Bearnaise Sauce
Add 1 tsp of pesto sauce to make an herby basil hollandaise
Add 2 tsp of Chipotle Paste to make a smoky spicy Chipotle Hollandaise