Steak Sandwich
A flavorful sandwich features tender steak, sharp cheddar, fresh arugula, and zesty horseradish mayo on toasted ciabatta.
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Instructions
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Preheat the broiler to high.
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Pound the flank steak, season with salt, pepper, and Worcestershire sauce, then marinate for at least 30 minutes.
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Heat oil in a large skillet over medium-high heat. Sear the steak for 3 minutes per side. Remove, then tent with foil to keep warm.
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In the same pan, melt butter over medium-low heat and sauté onions for 20 minutes until caramelized.
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While onions cook, whisk together mayonnaise, horseradish, garlic, and sour cream for the mayo.
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Brush ciabatta rolls with oil and toast under the preheated broiler until golden.
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Slice the cooked steak against the grain.
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Spread horseradish mayo on the toasted rolls, then layer with steak, cheese, caramelized onions, and arugula. Serve immediately.