Ingredients
17 tablespoons (2 sticks plus 1 tablespoon) unsalted butter
1 tablespoon white-wine vinegar
1 teaspoon white peppercorns, crushed
4 large egg yolks
Coarse salt
Juice of 1/2 lemon
Preparation
Melt butter in a small saucepan over medium heat; slowly bring to a boil, skimming froth from surface. Carefully pour melted butter into a small bowl, holding back the milky sediment in the bottom of the pan. The clarified butter should be the color of light olive oil; let cool to room temperature.
In a medium heavy-bottomed saucepan, mix vinegar with 1/4 cup cold water and crushed peppercorns. Place over medium-high heat until liquid is reduced by one third; remove from heat and let cool completely. Add egg yolks to cooled reduction and whisk to combine.
Place saucepan on a heat diffuser over very low heat; whisk, making sure the whisk comes in contact with the bottom of the pan. Gradually increase heat, whisking so the sauce emulsifies progressively and becomes smooth and creamy, 8 to 10 minutes; do not let the temperature of the sauce rise above 150 degrees.
Remove saucepan from heat and whisk in clarified butter in a slow, steady stream; season with salt. Stir in lemon. Line a chinois or fine-mesh strainer with cheesecloth; strain mixture and discard solids. Use sauce immediately.
