I threw in half a small onion, chopped.
I reheated the last cup of a black bean and barley curry stew I had made, which was just
-pressure cooked black beans and barley (a cup each and 7 cups of water in the pressure cooker made a ton of it, at the perfect thick stew consistency.)
-a large can of tomatoes
-a chopped onion
-sambar curry powder
-a bit of turmeric
I put the portobellas on a plate, spooned the cup of stew on top, and topped with the sauteed onions. I ate it with a side of green beans, and it was fabulous.
According to sparkpeople.com, there was no fat in the meal, either. Sweet.