In small mixing bowl stir together parsley, the 2 tablespoons mustard, the rosemary, thyme, garlic, oil, and pepper. Rub over top and sides of meat.

In a covered grill arrange hot coals around a drip pan. Test for medium heat above the drip pan.* Place roast on grill rack over drip pan, but not over coals. Insert a meat thermometer in center of roast. Lower the grill hood. Grill about 45 minutes or until thermometer registers 140 degrees F. (Or, place meat on a rack in a shallow roasting pan. Insert a meat thermometer into center of meat. Roast, uncovered, in a 325 degree F. oven for 30 to 45 minutes or until thermometer registers 140 degrees F.)

Cover meat with foil and let stand for 15 minutes (the temperature of the meat will rise 5 degrees F during standing).

Meanwhile, stir together sour cream and the 2 teaspoons mustard. Thinly slice meat. Serve with sour cream mixture. If desired, sprinkle with additional black pepper. Makes 8 servings.

*Note: To check for medium heat, hold your hand, palm side down, over the grill where the meat will cook and at about the same height of the meat. The heat is right when you can hold you hand there for only 3 seconds.