"Looking for the ultimate steak sandwich? Layered with sautéed mushrooms, caramelized onions, and zesty horseradish mayo, this recipe is one to savor!..."
INGREDIENTS
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4 ciabatta rolls (about 6-inches in length) (, split in half lengthwise to open)
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2 pan-seared steaks (, sliced (about 12-ounces each, 1- to 1-1/2 inch thick))
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8 ounces sliced cremini mushrooms
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1 tablespoon unsalted butter
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1/2 cup caramelized onions
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1/2 cup baby arugula
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kosher salt and freshly-ground black pepper
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1/2 cup mayonnaise
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1 tablespoon sour cream
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1 large garlic clove (, minced)
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1-2 tablespoons refrigerated prepared horseradish (, drained)
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kosher salt and freshly-ground black pepper