In A Small Bowl, Combine Cornstarch, Butter And Worcestershire Sauce Until Smooth. Stir In The Honey, Mustard And Pepper. Place Each Salmon Fillet On A Double Thickness Of Heavy-Duty Foil (About 18 In. X 12 In.). Drizzle With Honey Mixture And Sprinkle With Walnuts. Place Asparagus Around Salmon. Fold Foil Around Salmon And Seal Tightly. Grill, Covered, Over Medium Heat For 15-20 Minutes Or Until Fish Flakes Easily With A Fork.