Thailand's iconic green-skinned mango — eaten unripe-crunchy with chilli-salt-sugar dips, in som tam mamuang salads, or fully ripe when pale-amber and softer.
Royal Thai 'green-of-the-table' — *khiao* (green) + *sawoei* (royal-eating, a court honorific) — a name historically associated with the Thai royal court's preferred green-skinned mango. The cultivar's modern popularisation came from the Bang Khla district of Chachoengsao Province.
Khiao Sawoei (เขียวเสวย) — often Romanised Keow Savoy — is the iconic green-skinned mango of central Thailand, and a cultivar that defies the international convention that mangoes are eaten fully ripe. The Thai name unpacks as khiao (green) + sawoei (a royal honorific for eating, the verb reserved for the court's meals); together the name approximates "green royal-eating mango" — a court-quality green mango. The cultivar's modern commercial popularisation came from the Bang Khla district of Chachoengsao Province, where Khiao Sawoei orchards still anchor the region's mango economy.
A Khiao Sawoei is a substantial elongated fruit (250–500 g), with a thick, smooth, dark-green skin that retains its green colour even at full ripeness — only the very end of ripening produces a faint yellowing, and by then the fruit is past its preferred eating window in Thai culinary terms. The flesh, when the mango is mature but still firm, is pale yellow, crisp, and somewhere between a tart apple and an under-ripe peach in texture. Brix at this stage is around 12–14°, low for a mango, with a balanced sweet-tart profile that defines the cultivar.
The defining Thai use is eating the fruit at the mature-green stage rather than fully ripe. Sliced into batons or wedges and served with prik gleua — a dipping condiment of chilli, salt, sugar and sometimes fermented shrimp paste — Khiao Sawoei is the canonical Thai street-stall mango. It is also the dominant cultivar in som tam mamuang, the green mango salad with chilli, lime, fish sauce, palm sugar, peanuts and dried shrimp; the firm flesh holds up to shredding and the slight acidity is the salad's structural sweetness counterweight. Yam ma muang — a sour-spicy mango salad with seafood — uses the same fruit at the same stage.
Eaten fully ripe (rare in Thai usage but not unknown), Khiao Sawoei is a soft, pale-amber mango with a Brix of around 16–18° and a mild sweetness — pleasant but not memorable, especially next to Nam Dok Mai or Maha Chanok. The variety is also the dominant cultivar for mamuang dong — Thai pickled mango, sold in plastic-bag servings at every market — where the firm fruit ferments into the sour-salty snack that pairs with cold beer and grilled meat across central Thailand.