INGREDIENTS
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For the sandwich:
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1 pound flank steak
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8 slices ciabatta bread
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8 tablespoons of butter
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4 slices vintage cheddar cheese
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4 tablespoons horseradish cream (recipe below)
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2 medium yellow onions, sliced
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1-1/2 tablespoon olive oil
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1 cup sliced mushrooms
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For the horseradish cream:
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1/2 cup sour cream
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2 tablespoons freshly grated horseradish
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1/2 tablespoon Dijon mustard
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1/2 teaspoon white wine vinegar
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Salt and pepper