Hi! Argh! My daughter went through a faze like that. Her latest faze is, not eatting any meat or fruits. Just bread and tortilla. So annoying.
Try putting dipping sauce with his meal. Like ranch, ketchup, apple sauce, or yogurt. What works with my daughter, if we take a bite of her food infront of her and make a big deal on how yummy it is. We say "mmmmmm!! YUMMY!!!" then she takes the food and eats it for herself.