This is a fusion of 2 recipes I came across while I was planning to serve Chicken Burger for the family's meal. I saw the Chicken Patty recipe in the net while the idea of using Unagi Sauce for my sauce in the burger is taken from one of our local cook magazine here in the Philippines. The celery and parsley in the patty give a distinct taste compared to the usual chicken burger I am used to. The original recipe calls for left-over chicken - I used fresh ground chicken. The good thing also about this patty is you can store them for a month in the freezer and they still taste yummy. The unagi sauce complements the taste of the patty.