Chop up celery, apple, green onions, and orange bell pepper (please remove seeds and stem and all attached seedy parts). Cut red bell peppers in two, removing seeds, stem and all attached seedy parts.
In a large bowl, combine celery, apple, green onions, orange bell pepper, tuna (do not drain, add water from cans into bowl), mayonnaise, mustard, dill and lemon juice. Mix all ingredients with salad tongs until thoroughly mixed. As the tuna till be in chunks, please use tongs to more finely chop the tuna as you continue to mix.
Once mixed, spoon the tuna salad into each of the red pepper halves. Then, if you so desire, add salt and pepper to taste and enjoy!