Thailand's Most Addictive Salad Som tum is one of those dishes that hits every single flavour note -- sour, sweet, salty, spicy -- all at once. I fell in love with it at a street stall in Chiang Mai where a woman made it to order in a giant mortar, adjusting the heat level just by looking at me and deciding how much I could handle. I've been making my own version ever since. The Mortar and Pestle Method Traditional som tum is pounded, not mixed. You need a large mortar and pestle (a clay on