- 1½ teaspoons fresh lemon juice
- 1½ teaspoons Champagne vinegar
- 1 tablespoon minced shallots
- 2 egg yolks
- 1 cup water
- 12 tablespoons unsalted butter, melted and kept warm
- 2 tablespoons minced fresh tarragon
- Salt, to taste
- Place the lemon juice, vinegar and shallots in a medium, nonreactive bowl and allow to macerate for 10 minutes (the shallots should be soft). Add the egg yolks.
- Bring the water to a simmer in a 2-quart saucepan. Place the bowl of egg yolks over the saucepan (to create a double boiler). Whisking constantly, add the melted butter into the yolk mixture, drop by drop, until it begins to thicken.
- Remove the bowl from the heat and continue whisking in the remaining butter to make a smooth sauce. Whisk in the tarragon and season with salt. Serve with steak, artichokes or potatoes.