I notice that there seems to be a strong association between certain foods and sorethroat.
I found that on many occasions, after I took certain food such as fried stuffs (eg fried chickens), and fruits like durian, I was more prone to get sorethroat. Anyone can comment on this? I don't think we can find the answer to this in a medical textbook.

I think it's just your system reacting to the fried foods. Never heard of this before.