prepare grill for direct-heat cooking or position broiler rack so that meat on rack in pan is 4 inches from heat source,preheat broiler.
in bowl combine seasoning,salt,garlic powder and peppercorns. In another bowl mix sour cream,horseradish,parsley,vinegar and 1/4 tsp seasoning mixture refrigerate
stir oil into remaining seasoning mixture until blended with fork,rub both side of the steak with remaining seasoned-oil mixture.Grill or broil turning once 7 to 8 mins per side for medium-rare. let stand 10mins before slicing. grill or heat toast according to package directions, Top each piece of toast with arugula,steak slices and sauce
i think we left off the arugula cause couldn't find it ,but was still good