Mayo-Free Chicken Salad Sandwiches with Lemon and Herbs

pine nuts (optional)

shredded rotisserie chicken

celery ribs, thinly sliced

fresh thyme leaves

fresh parsley, chopped

lemons, juiced

Dijon mustard

shallot, minced

olive oil

salt and pepper

small croissants, pita bread, or lettuce cups, for serving