Preheat The Oven'S Broiler. In A Medium Bowl, Stir Together The Tuna, Celery, Green Onion, Mayonnaise, Lemon Juice And Curry Powder. Spoon Equal Amounts Onto Each English Muffin Half, And Top With A Slice Of Cheese. Place The Sandwiches On A Baking Sheet. Broil For 2 To 3 Minutes, Or Until Cheese Is Melted And Toasty. Serve Hot.