Marinated Beef Tenderloin

Ingredients 1 cup catsup 2 teaspoons prepared mustard 1/2 teaspoon Worcestershire sauce 1 1/2 cups water 2 (0.7-ounce) envelopes Italian salad dressing mix 1 (4- to 6-pound) beef tenderloin, trimmed Watercress (optional) Red and Green grapes (optional) Directions Combine catsup, mustard, Worcestershire sauce, water, and salad dressing mix; mix well. Spear meat in several places,