yes ar 食腸仔 & 午餐肉 are really not a good food.....may be you can try to blend the veg + meat and mix with rice. I think he will take it.
don't put a lot for the first try, you may put around 2 tbsp + soup mix with the rice.
if you want to get a good result, blend the veg + meat + 1 or 2 spoon of rice + little soup, then the result should be very fine.
xx aggie xx