Cá Kho Tộ (Caramelized Braised Fish)

In a clay pot (or heavy-bottomed saucepan), add the sugar in an even layer over medium heat. Do not stir. Watch it carefully — sugar caramelizes unevenly and can go from perfect to burnt in seconds. As the edges begin to melt and turn amber, tilt the pot gently to encourage even melting. Once about two-thirds of the sugar has melted and turned a deep amber-brown, you can stir very gently. Continue until the entire mass is a dark mahogany color, just beginning to smoke at the edges, and smells deeply bitter-sweet with a trace of smoky bitterness. This darker-than-usual caramel is intentional — the slight bitterness it carries is what gives cá kho tộ its distinctive complexity when balanced against the fish sauce and coconut water. Immediately and carefully pour in the coconut water (it will hiss violently) and stir to combine.

Once the caramel and coconut water have combined into a smooth, dark liquid, add the fish sauce, sliced shallots, garlic, halved chilies, and cracked black pepper. Stir gently and bring to a simmer over medium heat. Let the aromatics cook in the braising liquid for 3–4 minutes — the shallots should begin to soften and the garlic should turn translucent. The braising liquid at this stage should taste intensely salty, bitter-sweet, and funky from the fish sauce, with a spicy undercurrent from the chili and pepper. It will seem aggressively seasoned — this is correct, because the fish will dilute it during the braise.

Gently lay the catfish steaks into the braising liquid in a single layer. The liquid should come about halfway up the sides of the fish. Bring to a simmer over medium heat, then reduce to medium-low. Do not stir the fish — catfish steaks break apart easily and the intact shape is important both aesthetically and texturally. Instead, use a spoon to baste the top of the fish every few minutes with the braising liquid. Cook for 15–20 minutes, occasionally tilting the pot to redistribute the sauce. As the liquid reduces, it will thicken and darken further, beginning to glaze the bottom of the fish. The fish is done when it is just cooked through and the sauce has reduced by about half and coats the fish in a thick, glossy lacquer.

Scatter the spring onion greens over the finished fish while it is still in the pot, directly before serving. In Vietnamese tradition, cá kho tộ is served in the clay pot it was cooked in, placed on a small trivet at the table, so the sauce continues to very gently simmer from the residual heat of the clay. Each diner spoons the fish and sauce generously over their bowl of plain steamed rice. The correct way to eat it is to spoon the sauce first — it is intensely flavored and should be used to season the rice — and then eat the fish in pieces, dipping each into the pooled sauce on your rice. The bittersweet, salty, fish-sauce complexity of the reduced caramel is the entire point of the dish.