Email to Lucy Ashes Bourbon Sauce Source of Recipe Sunday_Dinner@yahoogroups.com Melt 1/4 cup butter in top of double boiler set over simmering water. Add 3 tablespoons bourbon, 1/4 cup sugar and 1 egg yolk. Whisk until mixture thickens slightly and candy thermometer registers 160F, about 1 minute. Remove from heat.