Add the scallions, garlic, celery and lemon zest and let them get fragrant for a minutes. Season it all with the dried parsley, dried tarragon, salt and pepper while they cook. Then add the lobster meat back in and let it cook with the mixture for another minute. Take the pan off of the heat. Meanwhile, toast the Portuguese rolls and butter them. Stuff each roll with half of the mixture and serve immediately! Enjoy!