Sonia Cabano, well known TV Cook and food writer, recently called Watermelon The King of Summer.  Growing up on a farm as children, it was the best pudding on a hot  summer's afternoon, lying in the shade of a huge tree nestled up against one of the twin gables of our farm house, on a leather throw listening to vinyls of some of the greatest singers and orchestras the 1950s and 1960s had to offer. It was only fairly recently that I realised that this monarch could be made into a fabulous savoury salad. You’ll need: 1 small red onion, sliced thinly