Made this last night. DW and I loved it. I used pork loin since I didn't have chicken. So...
...I sliced it across the grain, very thin. It was still a bit chewy, but not off-putting by any means.
I also added a ton of chopped baby bok choy. It released a bunch of liquid (as usual), so I simmered with the lid off in order to reduce the liquid a bit. Worked like a charm.
I will try chicken breasts next time, as I am not a fan of chicken thighs. (Too much trimming and knorple.) In order to assure tenderness, I'm thinking of adding a few tablespoons of cornstarch to the spices and tossing the chicken in that. It works great in other soups, so why not here?
Michael