Might be a texture thing. Just make sure he gets plenty of protein by giving him eggs, cottage cheese. If he'll still eat first foods, etc, it's better than him not getting the protein at all. Might also try putting it into a food processor and see if he'll eat it. If he eats it, then I you can be assured it's not the taste/flavor but rather the texture. Meat is DEFINITELY a different texture than all other foods.
In addition there is a book called FEED ME, I'M YOURS that tells you how to get kids to eat things, try things, etc and gives you some recipes, too. It would certainly be worth a shot.
You might be able to find this book at a HALF PRICE BOOKS store or on Amazon.