So sorry -- I really wanted to like this, but it just didn't work for me. I used chickpeas, 1 large egg, and one small onion. The mixture never really came together -- I had added in over 1/2 cup breadcrumbs, and it was still very mushy, not at all like a burger. I didn't want to add more breadcrumbs, feeling that I'd end up eating a bread sandwich. It really felt like hummus, except I can't use it as hummus because of the raw egg. Too bad! I loved your mix-and-match approach.