A clear, hot mussel soup

Having grown up with a poor cook, one of the things that until now I couldn't bear was a clear soup. I know this stems from Boxing Day turkey soup which often had the other offender pearl barley in it. Having to make a clear soup in order to recreate the kitchen diaries has reinforced the fact that the aforementioned poor cook would not have put any flavours in (such as the lime or coriander which is in this soup) and so obviously it was going to taste awful. This soup has got me over the psychological hurdle of voluntarily making a clear soup, but also demonstrated to me that I can really enjoy one. I had to cheat here because my local fishmonger doesn't open in a Monday and, yes you guessed it, my local massive supermarket doesn't stock shell on mussels unless you want them pre prepared with white wine or cream. I'm not going to beat myself up about this corner cut though. I'll definitely make this again.