Like another reviewer, I used chopped shitake in place of the celery and added some chili powder. I also added an additional half egg I had sitting in my fridge. Even with the extra egg, the final mixture didn't stick together and there seemed no hope of making anything remotely resembling patties. I greased a two quart baking pan, packed the mixture in, baked it according to directions and cut it into squares instead. The end result is good and I'll probably make it again, but it's really more like a casserole than a burger.
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