J.N.
He's discovered that it bothers you! If he's playing with his food, he's probably pretty much done eating. You can calmly take it away and clean up, acting like he's said "I'm full mom" (instead of like he's acting out).
Give him lots of chances to explore textures when he's not eating. He may just enjoy the way the food feels as he's smearing it around. Give him playdough (under supervision). Let him finger paint. Maybe even get some cheap shampoo and put a bit on his tray for him to rub around - you'll even have a clean tray when he's done!