Beef And Mushroom Platter
["2 c. water", "dash of salt", "few drops of lemon juice", "1 large white onion, peeled, thinly sliced, and separated into rings (2 c.)", "15 large fresh mushrooms", "1 1/2 lb. cold cooked roast beef, thinly sliced (deli works well)", "1/2 c. red wine vinegar", "2 tsp. Dijon mustard", "1 tsp. salt", "1/4 tsp. dried crushed marjoram", "1/4 tsp. dried dill weed or chervil", "1/4 tsp. pepper", "1 c. salad oil", "1 Tbsp. chopped parsley"]
["In saucepan, combine water, salt, and lemon juice; bring to boil.", "Drop in onion rings and remove immediately.", "Drain well on paper towel.", "Slice mushrooms into thick lengthwise pieces. Arrange meat, onions, and mushrooms in 13 x 9 x 2-inch dish.", "Stir together vinegar, mustard, remaining salt, herbs, and pepper. Gradually blend in oil.", "Pour over beef and vegetables.", "Cover with plastic wrap; chill several hours or overnight, basting occasionally.", "Sprinkle parsley on top.", "Serve on sandwich rolls. Yields 6 to 8 servings."]
["water", "salt", "drops of lemon juice", "white onion", "mushrooms", "cold cooked roast beef", "red wine vinegar", "mustard", "salt", "marjoram", "dill", "pepper", "salad oil", "parsley"]