"Enjoy your own Panera Bread Steak & White Cheddar Panini, even more, when you make this at home. ..."
INGREDIENTS
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1 cup sliced red onions (slice thin )
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1/2 cup white vinegar
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1 tablespoon sugar
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1 1/2 teaspoons salt
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1 cup warm water
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1 loaf ciabatta bread
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2 tablespoons pickled red onions
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2 tablespoons horseradish sauce
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6 ounces sliced roast beef
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4 slices white Cheddar cheese
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cooking spray for pan
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