If it looks nasty, put cheese on it.
I warmed up some spinach that I had frozen awhile back, and ran it through the food processor. I mixed it with baby rice cereal because CP seems to eat anything if it's mixed with rice cereal.
It looked disgusting. I didn't even want to test it to make sure it wasn't too hot. So I melted some cheese into it. It actually tasted okay. Not something I'd seek out for lunch or anything, but better than mashed up green beans for sure. He ate several bites and enthusiastically signed for more. Then all of a sudden he must have realized I was trying to pull one over on him because he signed "all done" and wouldn't take another bite, not even when I flew the spoon at his mouth with appropriate motorcycle and/or airplane noises.
We'll try again at lunch tomorrow.