Ingredients
1/2 cup (1 stick) unsalted butter
2 large egg yolks
1 cup packed dark-brown sugar
1 teaspoon pure vanilla extract
1/4 cup good-quality bourbon
Preparation
Put butter, egg yolks, brown sugar, vanilla, and bourbon in a heatproof bowl set over a pan of simmering water. Cook, whisking constantly, until mixture registers 160 degrees on a candy thermometer, about 7 minutes.
