Rub steaks with lime juice and ginger. Heat grill, broiler or cast iron grill pan. Grill fish for 3 minutes per side for medium rare steak. Grill bread to toast. In a small bowl mix together the mayonnaise, lime juice, horseradish and cayenne. Spread mayonnaise mixture on grilled bread and top with tuna steak, water cress and second slice of bread.
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