Sprinkle salt and pepper over steaks.Melt 2 tablespoons of the butter in large heavy skillet over medium-high heat. Add steaks to skillet and cook 4 minutes on each side or until desired doneness. Remove from skillet: keep warm.
Melt remaining 2 tablespoons butter in skillet over medium-high heat and add shallots and garlic. Sauté 2 minutes or until lightly browned. Add wine, mustard and capers; simmer until slightly thickened,about 5 minutes. Spoon sauce over steaks. Garnish with chopped tomato,if desired.
NOTE: If preferred, substitute beef broth for the red wine called for in this recipe.