Preheat broiler.

In a bowl, combine the tuna, celery, parsley, pickle relish, lemon juice and mayonnaise (see note for options). Toss with a fork until well mixed.Place bread slices on a broiler pan. Divide the tuna mixture evenly, mounding slightly. Sprinkle cheddar evenly over the tuna mixture.

Place open face under broiler until cheese just begin to bubble (3 to 4 minutes), watch carefully or cheese may brown too much. If serving open face they're ready, otherwise cover with top slice of bread and place under broiler until top slices toast.

Serve.

Note: Optionally add, chopped capers, some celery salt, finely diced onion slice of tomato.