If there was such a thing as a 'Salad Hall of Fame', Thailand's zesty own breed, or 'yam' as they are known here, would surely take pride of place. Unconvinced? Experience the fresh, fiery thrill of yam nua - with its sprightly mix of onion, coriander, spearmint, lime, dried chili and tender strips of beef - and you won't be. It perfectly embodies the invigorating in-the-mouth-thrill of all Thai salads, the yummy-ness of yam.