good beef makes for a juicy burger, no other thing will do. the best " fast food"chain i know of is Burgerville here in Portland OR and vicinity. They use Oregon Country Beef which is hormone free and never frozen and grown by local farmers and the burgers are great. I sometimes buy beef for good burgers from Gartners meats ( http://www.gartnersmeats.com)a local butcher who’s been around for many years. There is a marked difference between their fresh ground "ground beef" and supermarket varieties.