Cá kho tộ: Vietnamese fish stew with caramel and black pepper

The sauce makes all the difference

Cá kho tộ is a Vietnamese fish stew, prepared here in the southern Vietnamese style with coconut water and a dark caramel sauce. The name refers to tộ, an earthenware pot in which the dish is often cooked. A heavy-bottomed pan works well at home, too: it holds the heat evenly. The sauce should become concentrated and sticky, but not syrupy or bitter. The fish should stay intact and take on the flavor of the sauce without getting lost in it.

Use firm fish cut into thick steaks, preferably with the bone in. Catfish-like fish are commonly used in Vietnam; in Dutch shops, pangasius can be an accessible choice. Firm pieces of cod work, too, but they fall apart more easily and are best turned as little as possible. Cut the steaks about three centimeters thick so the outside cooks while the center stays juicy. Coconut water adds a mild sweetness and helps build the sauce. Use unsweetened coconut water from a carton or can, not coconut milk: it makes the result creamier and changes the character of the stew.

The caramel sauce needs attention, especially in the first minute. Melt the sugar until deep amber, not dark brown: if the caramel goes too far, it turns bitter. Then carefully add the coconut water, as the hot caramel can bubble up and temporarily harden. Gentle heating will dissolve it again. Fish sauce adds salt and savoriness, while black pepper brings a warm, pronounced heat. Let the fish simmer gently rather than boil. Vigorous bubbling and lots of stirring can damage the steaks; instead, spoon the sauce over them from time to time.

Shallot and garlic give the sauce a savory base. A small red chili is optional: leave it out for a milder stew or use more for extra heat. If you don't have coconut water, water with a small extra pinch of sugar can work, though the flavor will be less rounded. Taste the sauce toward the end; fish sauce varies by brand, and reducing the sauce makes it saltier. Only then, if the sauce is too intense, add a splash of water.

Serve the fish with fragrant white jasmine rice to soak up the sauce. A simple vegetable on the side, such as steamed bok choy or cucumber, adds freshness alongside the rich, salty caramel. Quickly refrigerate any leftovers in a sealed container and eat them within two days. Reheat them gently in a pan with a small splash of water; don't stir vigorously, so the fish steaks stay intact.