how about helping him cook your tea/dinner?
Get out the ingredients for your dinner and let him chop, fry, etc etc
Make it as colourful as you can - peas, carrots, broccoli
Let him help you with filling pans of water, chopping carrots, putting it onto the water to boil up
Have it with chicken or pork as he does eat that and perhaps cheese sauce instead of gravy
Just the odd thing popped into your mouth as you go, nothing said to him when you do it, and a few mmm, mmm noises
don't try to persuade him to eat it because he has helped but just out it onto his plate - as small a portion as possible and take it from there
He might have a go at it because he helped you cook it
It's all about subliminal messages =)
Although I must say that is a weird one