Ingredients:
2 tbsp white vinegar
2 tbsp dry white wine
2 tsp shallots, finely minced
1 tbsp fresh tarragon, divided
3 egg yolks
1/2 cup (1 stick) unsalted butter, melted
Salt and pepper, to taste
(Optional) Squeeze of lemon juice
Instructions:
1. Make the Reduction:
In a small saucepan, combine white vinegar, white wine, shallots, and half of the tarragon.
Simmer over medium heat until the liquid reduces to about 1 tablespoon.
Strain (optional) and let it cool slightly.
2. Set Up a Double Boiler:
Place a heatproof bowl over a saucepan of simmering water (don’t let the bottom touch the water).
Add the egg yolks and the reduction to the bowl.
3. Whisk Constantly:
Whisk the yolks until they begin to thicken and become pale (about 2–3 minutes).
4. Add Butter Slowly:
Very slowly drizzle in the melted butter, whisking constantly, until thick and creamy.
(If it gets too thick, you can add a few drops of warm water.)
5. Finish:
Stir in the remaining fresh tarragon, season with salt and pepper, and add a squeeze of lemon juice if using.
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