Chef John's Ultimate Steak Sandwich

By Chef John

4.11 / 5

10min

20min

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