Along with talking to locals, visiting historical sites and browsing museums and shops, eating—and cooking—the regional cuisine always helps me to understand a new place. When I don’t have friends to show me the culinary ropes, I turn to hands-on cooking classes. That’s how I ended up at the Green Mango Thai Cookery School in Chiang Mai,Thailand. Situated on a lush, bamboo- and coconut-tree lined property about 20 minutes from the center of Chiang Mai, Green Mango provided a lovely setting, well-stocked cook stations and delicious, classic recipes. Better still, it gave me a chance to learn from a native chef, shop for fresh ingredients and cook like Northern Thais do. Among the traditional dishes made at Green Mango was khao soi (also spelled “kôw soy”). A specialty of Chiang Mai, this spicy curry features red curry paste, wheat- and egg-noodles and beef or chicken. Since I was the lone pescetarian in attendance, I was allowed to make an untraditional version of this culinary icon, shrimp khao soi. To begin, I pummeled together such Thai …