Regional highlights
Pad thai
Rice noodles stir-fried with egg, bean sprouts, dried shrimp, tofu and spring onion in a tamarind-fish sauce-palm sugar sauce, finished with peanuts and lime — the most ordered dish on Koh Tao and the dish that reveals the most about a particular stall's quality. The version at dedicated pad thai carts near the Sairee market (where the cook makes only this dish from 08:00 to sold out, typically 14:00) is noticeably better than the beach-bar versions which make everything and prioritise convenience over craft. The prawn pad thai (goong) is the upgrade worth ordering when the morning catch is in.
Khao pad (Thai fried rice)
The practical post-dive meal of Koh Tao — day-old jasmine rice stir-fried with egg, garlic, onion, fish sauce and your choice of protein (chicken, prawn, crab, pork or tofu), finished with cucumber, spring onion and a wedge of lime. Simple, filling, inexpensive and made in under three minutes at any Koh Tao kitchen. The crab fried rice (khao pad pu) at seafront restaurants using the daily catch from the Mae Haad pier is the version worth seeking; the standard chicken version is universally available and adequately done everywhere.
Tom yum goong
Thailand's sour-spicy prawn soup — lemongrass, galangal, kaffir lime leaves, chilli and fish sauce in a clear broth with fresh Gulf of Thailand prawns, finished with lime and coriander. Koh Tao sits in the Gulf of Thailand rather than the Andaman; the local prawns are smaller than the Andaman tiger prawns of Phuket but very fresh from the Mae Haad fishing boats. The morning market in Ban Mae Haad has the most honest tom yum, made for local Thai residents and dive school staff rather than tourists.
Grilled reef fish
The daily catch from Koh Tao's surrounding reefs and from the Gulf of Thailand — red snapper, parrotfish, barramundi and grouper — grilled whole over charcoal at beach restaurants along the west coast (Sairee, Haad Tien) and at the Mae Haad pier-side restaurants. The preparation is minimal: scored fish, a marinade of garlic, lemongrass and fish sauce, charcoal, and a fresh chilli-lime dipping sauce. Quality is entirely dependent on freshness; the restaurants near the Mae Haad pier buying directly from fishing boats serve measurably fresher fish than those supplied by the island's wholesale market.
Som tam (green papaya salad)
Pounded green papaya with chilli, garlic, tomato, dried shrimp, peanuts and lime-fish sauce dressing — a Thai constant that Koh Tao's vendors do straightforwardly well. The som tam at the Chalok Ban Kao village vendors in the island's south (a 10-minute drive from Sairee) is made by Thai families for a local market and is spicier and more authentic than the beach-bar versions. The dish functions as the perfect pre-dive snack — light, acidic, stimulating — and as a palate cleanser between heavier courses.
Green curry
Chicken or prawn in a coconut-milk sauce made from freshly pounded green chilli paste with lemongrass, galangal, kaffir lime and sweet basil, with Thai aubergines and bamboo shoots. The green curry at dedicated Thai cook shops on Koh Tao is genuinely good; at beach bars and dive-school restaurants it is made milder and sweeter for international guests. A useful backup when grilled fish is not available or when post-dive appetite requires something heartier.
Mango sticky rice
Glutinous sticky rice steamed in salted coconut milk, served with ripe Thai mango and sweetened coconut cream topping. On Koh Tao, a few dedicated dessert vendors near the Sairee market and at the Mae Haad pier area serve this consistently — the most reliable Thai dessert available on the island. Quality follows mango season (best March–June); the version outside this period uses less-sweet Thai mangoes that are more starchy than fruity.