Cold Beef Platter
["1 (2 1/2 to 3 lb.) rump roast", "1 (14 1/2 oz.) can asparagus spears", "1 (3 oz.) can sliced or whole mushrooms", "1 1/3 c. vegetable oil", "1/2 c. white vinegar", "1/2 tsp. garlic powder", "2 tsp. sugar", "1 1/2 tsp. salt", "1 1/2 tsp. dry mustard", "freshly ground pepper"]
["Roast rump roast at 325\u00b0 for 1 1/2 to 2 hours.", "Cool.", "Cut into 1/4-inch slices.", "Place in shallow dish.", "Arrange next 2 ingredients over meat.", "Blend remaining ingredients; pour over roast.", "Cover and chill 2 1/2 hours.", "Drain marinade.", "Arrange on platter.", "Serves 6."]
["rump roast", "mushrooms", "vegetable oil", "white vinegar", "garlic powder", "sugar", "salt", "dry mustard", "freshly ground pepper"]