Can I substitute miso for the fermented black beans if I'm unable to find them? Thank you!

Because black bean sauce is liquid, it will change the recipe and texture. I broke down and ordered some black beans from Amazon and I'm so glad I did. If you think you'd use them in other recipes as well as this one, it's well worth it.

These are my favorite and recommended by Woks Of Life.

https://www.amazon.com/gp/product/B00013WX7O/ref=ox_sc_sfl_title_3?ie=UTF8&psc=1&smid=A2ZLWOZUKSGHGI

Miso could give it a nice, rounded flavor, but there is something really different about the black beans. I have also used the jarred sauce versions that might be easier to find- typically they have a black bean garlic sauce- in which case I use a bit less garlic.