Grilled Grouper with Creamed Leeks

Preparation : Preparation : Preheat broiler or prepare barbecue grill. Wash fish and pat dry with paper towels. Combine wine and mustard and brush fish with this mixture. Cook fish for 5 minutes on each side. Transfer to a platter and cover with aluminum foil to keep warm. Bring water to boil in a large skillet with butter, salt and pepper. Add sliced leeks and cook uncovered for 6 minutes. Add cream and boil for 3 more minutes. Place leek mixture in the center of 4 heated plates and top with fish fillets. Decorate each plate with half a lemon.