We often fly to Portugal when we go to Spain to visit my family. It sounds nuts, doesn't it? But the nearest airports to my hometown with flights to London are Santiago de Compostela in Galicia (Spain) or Porto (Portugal). Flying back from Porto a couple of weeks ago I picked up a copy of the official Portuguese Bimby magazine (yep, the Thermomix is called Bimby in Portugal, not in Spain though). There I found the recipe this Watercress soup (well, I have adapted it slightly).
The flavour is light and delicate and I fully recommend it as a variation on heavier soups.