Chef John's Ultimate Steak Sandwich
Ingredients:
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1 (2 pound) fully-trimmed flat iron steak
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salt and pepper
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8 ounces brown clamshell mushrooms, grilled, separated
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salt and pepper to taste
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1 tablespoon sherry vinegar
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2 tablespoons extra virgin olive oil
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3 tablespoons barbeque sauce
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2 tablespoons vegetable oil
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1 tablespoon cider vinegar
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6 hot dog buns
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½ cup mayonnaise, or as needed
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1 cup arugula leaves, or as needed
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1 cup quartered cherry tomatoes