Drain the tuna, place in a medium bowl and use a fork to flake into pieces. Add the mayonnaise, pickles, celery, green onion, dill, parsley, lemon juice and oil. Season to taste with salt and pepper and combine well. Taste and adjust all seasonings to your liking if needed. The tuna salad will keep in an airtight container in the refrigerator for up to three days.
Divide the tuna salad among the bottom halves of the rolls, top off with potato chips, sandwich with the ciabatta tops and serve.