Meanwhile, in 8-inch skillet, melt 2 tablespoons of the butter over medium-high heat. Add shallots; cook about 1 minute, stirring frequently. Add wine; cook about 4 minutes until reduced slightly. Stir in broth. Heat to boiling. Reduce heat to medium-low; cook about 10 minutes longer, stirring occasionally, until reduced to about 1 cup. Beat in remaining 4 tablespoons butter, 1 tablespoon at a time, with wire whisk. Beat in 1/2 teaspoon pepper.