Hello, Sorry about these crying spells. Difficult to judge the cause unless a pediatrician assesses him during his fits of crying. If not hungry or wet, the cause could be some physical pain or attention seeking. You could try giving him a pacifier or plan your meal at home when he naps.
You could also try drug like benadryl/phenergan quarter spoonful couple of times a day.
Could also be some strong smell from cooked food that he dislikes.
I think he is seeking attention all the time. so my question is to ask for advise and ideas on how to deal with this.
This age there can be no specific strategy to counter this behavior. Just have to bear with his tantrum. An attractive toy or some other distraction may be offered.