Not sure how this goes on sandwich... Maybe use thickener?? I didn't use onion, I did use powdered garlic...no chicken flavor so I added salt and pepper and diced two tomato without skin. I'm going to cook until carrots are soft then put over noodles. That or add rice and mushroom soup or put over noodles. Not sure yet...so far flavor is awesome!
I added a 6 oz. can of tomato paste. Otherwise, I don't know how you could serve it on buns without some kind of binder. It was delicious!