Here's one that I've had good luck with;
Béarnaise Sauce
Ingredients:
1/4 cup Champagne or white wine vinegar
1/4 cup good white wine
2 tablespoons minced shallots
3 tablespoons chopped fresh tarragon leaves, divided
Kosher salt
Freshly ground black pepper
3 extra-large egg yolks*
1/2 pound (2 sticks) unsalted butter, melted
6 (1-inch thick) rib eye steaks
Olive Oil
Coarsely ground black pepper
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Directions:
For the sauce, put the Champagne vinegar, white wine, shallots, 1 tablespoon tarragon leaves, 1/4 teaspoon salt, and 1/4 teaspoon pepper in a small saucepan. Bring to a boil and simmer over medium heat for about 5 minutes, until the mixture is reduced to a few tablespoons. Cool slightly.
Place the cooled mixture with the egg yolks and 1 teaspoon salt in the jar of a blender and blend for 30 seconds. With blender on, slowly pour the hot butter through the opening in the lid. Add the remaining 2 tablespoons of tarragon leaves and blend only for a second. If the sauce is too thick, add a tablespoon of white wine to thin. Keep at room temperature until serving.