good luck... you can also try buying frozen mixed veg... put them into a little bowl, put some water on top and a very little boiled water, just to defrost them and warm them slightly. then discard the water and give the veg to the child... i used to do that for a snack when they were that age and it's great for them to practice using their fingers but also healthy!
i'm guessing he revolted from the congee because he needs more variety and different textures... problem is now, that he's not used to having the different textures and tastes so he's not really sure what to do.
try a little chicken breast with rice, an egg and choi sum (chopped really finely)...
spaghetti bol: make the sauce with a can of tomatoes, chopped, a little onion, (my son LOVES mushrooms, my daughter HATES them), with some cheese mixed in...
mac & cheese with pureed sweet potatoes or cauliflower or carrot mixed in...
mild curry with chicken and eggplant (SEE THE RECIPE ON HERE)...(both of my kids love it)
pancakes (for extra goodness, put in some fresh blueberries~ if he doesn't like them whole, then puree them....pancakes come out blue! for pink pancakes, buy some beetroot and puree that and add it in!) with a small sausage cut up on the side...
sandwiches:
peanut butter
cucumber
cheese
ham (my kids LOVE ham & cheese)
if you are feeling adventurous, then buy some cookie cutters and cut the sandwiches into cool shapes (can be done with pancakes, too!)
dumplings...(both of my kids love them!)
roast chicken, stuffing, gravy, creamed corn, mash (one meal my picky eater NEVER fusses at!)