I did a couple of sub's...I used 1 med. onion instead of the two scallions and "Better than eggs" in place of the two eggs. I had a hard time making it stick together in the pan so I will try adding an add'l 2 eggs (Better than eggs) next time and see if that will hold it together.
I would change the serving size, they were too large; I would make 6 burgs and not 4. I would not take this one for a work lunch, just because of the garlic. It was very tasty and the hummus made it pop! It's also very filling and a little on the heavy side b/c of the added fat calories. I might try to bake these next time and replace the fat with water to slim it down a little.
All-in-all, a very nice recipe and I would make again.