Larb gai is a dish of browned ground chicken, mint, basil and red onions dressed with lime juice and ground red chiles that's popular in Laos and Isan, neighboring rural sections of Thailand. (The dish is sometimes spelled laab, lob or lop.) It's perfect hot weather food: spicy, crunchy and light, but rich in flavors and contrasts. Traditionally, this dish is made with a roasted rice powder that's prepared by toasting raw rice in a wok, then grounding it to a powder, but you can find premade…