INGREDIENTS
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1 1/2 pounds sirloin steak tips, flap meat, or flank steak, cut into 3-inch pieces
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1/4 cup tamari or soy sauce
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2 tablespoons vegetable oil
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2 tablespoons balsamic vinegar
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1 tablespoon granulated sugar
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2 cloves garlic, minced
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1 teaspoon Dijon mustard
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1/2 teaspoon kosher salt
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1/4 teaspoon freshly ground black pepper
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2 tablespoons vegetable oil
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1 pound cremini mushrooms, halved or quartered if large
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2 tablespoons balsamic vinegar
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2 tablespoons unsalted butter