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"These sandwiches are so yummy and the Parmesan Horseradish Mayo takes them over the top!" 1 medium sweet onion, sliced 1 green pepper, sliced 2 Tablespoons canola oil Leftover shredded roast beef or I have used 1 pound of shaved Angus roast beef from the deli 4 Slices of mozzarella, Swiss or provolone cheese 4 Hoagie rolls packet of Au jus, we love Knorr brand Parmesan Ho
