Ingredients
1 cup white wine
1/2 cup white-wine vinegar
1 shallot, sliced
1 (1-inch) piece lemongrass, crushed
1 sprig thyme
2 tablespoons heavy cream
1 1/4 cups (2 sticks plus 4 tablespoons) cold unsalted butter, cut into cubes
2 tablespoons yuzu or lemon juice
2 tablespoons capers, drained and chopped
Coarse salt and freshly ground pepper
Preparation
Place wine, vinegar, shallot, lemongrass, and thyme in a small saucepan; bring to a boil over medium-high heat. Cook until reduced by one-quarter. Remove from heat and strain through a fine-mesh sieve. Return to saucepan and stir in heavy cream.
Remove from heat and slowly whisk in butter until fully incorporated. Stir in yuzu juice and capers; season with salt and pepper.