M.W.
Here's my experience with a picky eater. My nearly 3 year old daughter has had a few phases of picky eating. Normally she's eaten most everything, but whenever there is a change in her life she rebells in her eating habits.
I have never catered to her when it comes to choices of foods, unless it is something she could not chew and blending wasn't an option. She is required to eat small portions of everything we have for dinner, even if we have to help her. She can throw a fit over meals for a days or even weeks (as when her sister was born), but we continue to be consistent about requiring her to eat everything and she eventually does it all on her own. It isn't always easy, but its worth training her tastes at this early age, it will benefit her in the long run. Our country has such a problem with eating disorders of all varieties, that teaching our children to eat well balanced meals, fruits, vegetables, whole grains and legumes is the best way to combat that.
I know this is tough, but he needs to learn to eat healthy food, period. Disguising foods isn't teaching him to eat it, just fooling him - or teaching him not to trust you about what you've said you've given him to eat. Your child won't starve, he'll do just fine. This is just like teaching him to obey you.
Best wishes, you can do it!