Savory Key Lime Sauce

Melt butter in heavy large skillet over medium heat. Add onion and shallot and sauté 3 minutes. Add wine and boil until liquid is reduced by half, stirring occasionally, about 5 minutes. Add both stocks and boil until liquid is reduced to 6 tablespoons, stirring frequently, about 13 minutes. Add whipping cream and boil until sauce is reduced to 1 cup, stirring frequently, about 7 minutes. Mix in fresh lime juice. Season sauce to taste with salt and pepper.