Most people are introduced to galangal, a relative of ginger, by way of Thai curries and seafood soups. The rhizome is seldom used in Vietnamese cooking, but when it is, it is paired with other bold-flavored ingredients. Here, its pungent heat brightens a northern fish kho, with the bittersweet caramel sauce tempering its fire. Use the smaller amount of galangal if you want a dish with less intensity. Although salmon isn’t native to Vietnam, it takes on the robust flavors of the kho remarkably well. Fresh side pork (pork belly), which you can find at Asian markets, is the stealth ingredient here, enrobing everything with its richness to create a unique surf-and-turf combination. The result is spicy, savory, and a touch sweet.
To simmer the fish in a clay pot, use a small (1 1/2-quart) Japanese donabe about 8 inches wide. For details on clay pot cooking, see opposite.
