INGREDIENTS
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8 hamburger buns
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1 lb thinly sliced roast beef
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16 slices provolone cheese
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For the sauce!
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3 Tbsp freshly minced onion (grate onion on a couple of paper towels and squeeze out the excess moisture)
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1/4 cup mayonnaise
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1 Tbsp spicy brown mustard
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1 Tbsp prepared horseradish
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1 Tbsp poppy seeds
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1 dash Worcestershire sauce
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1/2 tsp garlic powder