Preheat oven to 325°F.
Combine bread, parsley, mustard, mayonnaise, Parmesan cheese, garlic, TABASCO® Sauce, oregano and salt in medium bowl; stir to mix well.
Place leg of lamb fat-side up on rack in open roasting pan. Pat crumb mixture on outside of lamb. Insert meat thermometer into center of lamb, being careful that thermometer does not touch bone. Roast lamb about 2 1/2 hours or until meat thermometer reaches 160°F for medium (20 to 25 minutes per pound) or until desired doneness. Cover lamb with foil, as necessary.
To serve, place lamb on warm platter; let stand 15 minutes for easier carving. Garnish with fresh herbs, grapes and kumquats, if desired.
Makes 10 servings.