This was a neat little experiment that came out really good. My meat didn't brown the way I would have preferred but it didn't come out tough.
Melt 1/2 cube of nucoa in a deep skillet. Saute 1 chopped onion, 1-2 pounds cubed pork (I had purchased pork stew meat so I am not positive what cut it was), and sliced mushrooms (I buy mine pre-sliced since it's the same price as whole mushrooms - I think it's 8 oz). Cook until the onions are translucent and the pork is cooked thoroughly. Mix 2 TBs cornstarch into 2 cups milk (I used soy just fine). Pour over meat and veggies. Stir carefully until the sauce is thick. Season with gluten-free soy sauce and serve over rice. It wasn't overly saucey so if you want more sauce add 1 TB cornstarch to each cup of milk and mix together before adding to pan.