We've just been to Spain and while we were there we ended up in quite a touristy restaurant. There we ate paella which was terrible, at least in my opinion. Then I was wondering how fresh (or not) it was. The prawns were still in their shell but some of them had developed some white areas.
So my question is: do these white spots on the shell indicate that they had been frozen? Or can a prawn go white too if it is boiled or fried straight after being caught?
Just for the record: I'm sure they had been frozen because they didn't taste very nice.