Line 9 x 13 pan with alumium foil. Leave excess foil to wrap over top of buns. Slice rolls and assemble sandwiches with ham, topped with chese. Place sandwich in foiled pan. Set aside. Make butter topping: in small saucepan mix marg, onion, mustard, lemon juice, poppy seed, and season salt. Boil 1 min. Open each sandwich and spoon in mixture. Put last of mix over the tops of buns. Wrap sandwiches loosly in foil. Bake 20-30 min or until heated thru and cheese melted. Serve immediatley.
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