Ingredients

• 200g unsalted butter
• 1/4 cup white-wine vinegar or verjuice
• pinch of coarsely ground white pepper
• 2 tablespoons water
• 3 egg yolks
• juice of 1/2 lemon

Directions

1. Melt butter gently and allow to cool a little

2. Put vinegar, pepper and water into a small saucepan and reduce over heat to 1 tablespoon liquid

3. Transfer to small bowl that fits comfortably over a stable small saucepan half-filled with hot water

4. Add egg yolks and whisk over a moderate heat until thick and foamy

5. Whisk in butter a little at a time, still over heat

6. When all butter has been incorporated you should have a bowl of thick, creamy sauce.

7. Add lemon juice to taste

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