Preheat a grill
, using medium high heat. In a food processor
, combine all ingredients except for tenderloin. Puree
until well incorporated. Set aside. Season tenderloin with salt and pepper to taste, and grill to desired doneness, or about 5 minutes per side for medium-rare. Remove from heat and top each filet with the gorgonzola butter, dividing evenly, or about 2 tablespoons per filet.