So we're still in the middle of a heatwave...so today I've got a suggestion for a salad that is part tasty feta, olives and herbs, and part refreshing, juicy watermelon. It's a funny old time of year. The things I usually love to eat - pasty, pastry, curry or warm lentils - are all just too, too heavy to enjoy when it's hot by day and still warm by night.