C.S.
I sneak spinach and other veggies in all the time. Chop the spinach up and sneak it in his grilled sandwich, it has very little taste. Sprinkle it on his potatoes (fried or mashed) or rice. Can you cut them very fine and sneak carrots and spinach in the rice? What about a beef or chicken soup with big chunks of potato and fine chopped tomato, spinach, carrots, celery, etc. I do it all the time even if it is a little, at least I get it in there. Spoon feed him and bribe him at this point.