Name: Ca Loc Nuong Trui (Whole Snakehead Grilled in a Straw Fire)
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Yield: 4 servings
Cuisine: Vietnamese
Ingredients: 1 Snakehead fish; 2 bundles Dry rice straw; 1 Green bamboo stake; 3 tbsp Spring onion oil; 3 tbsp Roasted peanuts; 3 tbsp Fish sauce; 2 tbsp Sugar; 2 tbsp Lime juice; 4 tbsp Water; 2 cloves Garlic; 1 Red chilli; 12 Rice paper rounds; 200 g Rice vermicelli; 1 platter Lettuce, perilla, mint, coriander; 1 platter Green banana, star fruit, cucumber

Ingredients

4servings

Snakehead fish · 700-900g, whole — not scaled and not gutted1
Dry rice straw · enough to bury the fish; see Variations if you have none2 bundles
Green bamboo stake · 30cm longer than the fish; a sugarcane stalk is also used1
Spring onion oil · sliced spring onion dropped into hot oil3 tbsp
Roasted peanuts · coarsely chopped3 tbsp
Nuoc cham
Fish sauce3 tbsp
Sugar2 tbsp
Lime juice2 tbsp
Water4 tbsp
Garlic · minced2 cloves
Red chilli · minced1
To serve
Rice paper rounds12
Rice vermicelli · boiled and rinsed cold200 g
Lettuce, perilla, mint, coriander1 platter
Green banana, star fruit, cucumber · sliced thin1 platter

Steps

Rinse the snakehead and do nothing else to it. Do not scale it and do not gut it — those scales and that skin are the equipment this dish runs on.
⏲ 3 min
Drive the bamboo stake through it from mouth to tail, keeping it straight and just under the backbone rather than through the flesh.
⏲ 3 min
Push the bottom of the stake 20cm into the ground so the fish stands upright. Laid flat, the underside chars while the top stays raw.
⏲ 2 min
Bury it under dry rice straw until you cannot see it, and light the straw. Do not wait for coals — a straw fire never makes any.
⏲ 2 min
When the straw has burnt out the scales are black and hard. Add a second armful for a large fish. Press the flesh along the back: when the spring has gone, it is done.
⏲ 10 min
Knock the ash off and scrape the burnt scales and skin away with the back of a knife. They lift off in sheets, and the flesh under them carries only the smoke. Open the belly and take the guts out now.
⏲ 5 min
Spoon spring onion oil over the flesh and scatter the chopped peanuts. Stir the nuoc cham together in a separate bowl.
⏲ 3 min
Dip a rice paper round, pile on noodles, herbs, fruit and a piece of the fish, roll it, and dip it in the nuoc cham. Everyone builds their own at the table.

Variations

A sugarcane stake instead of bamboo: it chars and lends a little of its sugar to the flesh, and is common in the south.
Salt and chilli instead of nuoc cham: coarse salt pounded with green chilli and lime, for when you want the fish itself in front.

More detail and the reasons why (2)

Over charcoal or a gas grill: with no straw to hand, leave the scales on and cook over the fiercest direct heat you have until the skin is black and hard. You lose most of the smoke and keep the structure — the layer that burns is not the layer you eat. Under an oven broiler, 20cm down for 20-25 minutes.
Tilapia: any scaled freshwater fish of about this size works if snakehead is hard to find. The coarser the scales, the more easily the skin lifts. A scaleless fish such as catfish has no layer to sacrifice and does not suit the method.

Tips

The same rice straw does an entirely different job elsewhere. Hongeo-hoe uses rice straw not as fuel but as a source of bacteria: "Lay rice straw in the bottom of a crock or a box, put the fish on it and cover it with more straw." The same material is a starter culture at room temperature in one dish and a three-minute fuel in this one.
Do not read doneness off the scales. They go black inside a minute, with the flesh still raw behind them. Pressing along the back is the test at the fire. Once the scales are scraped off, check again that the thickest flesh by the backbone is opaque and flakes. If it is still translucent, burn another layer of straw over it: snakehead and other freshwater fish carry parasites (Gnathostoma), so it is not served underdone.

More detail and the reasons why (6)

There is no fire to wait for. Grilling is emphatic about charcoal — "Everything above starts from a fire that is already burning steadily." — and nyama choma calls skipping that wait the commonest failure there is: "The commonest failure is putting meat over coals that are still flaming: the outside chars while the inside stays raw, and there is no recovering from it." A straw fire has no such stage. The flames are the whole of it and an armful is gone in two or three minutes, so the entire cook happens in the window every charcoal dish is written to get past.
Which is why the scales stay on. The same guide handles the case where the charred surface is thrown away and states the rule plainly: "a luminous fire only costs you something on a surface you are going to eat." Here the surface the flames reach is a layer being discarded, so the luminous fire costs nothing. It is the structure baba ganoush describes for its aubergine — "The blackened skin is a wrapper, not a surface, and it is thrown away entire" — with one difference: nobody put this wrapper on. The fish arrives wearing it.
What the distance rule is measuring changes with it. The guide sets it out: with a barrier in the way the question becomes "how much heat has to get through a barrier — and that depends on whether what is under the barrier has to cook at all." Here the answer is yes, and the barrier is one layer of scale, so the short violent heat of burning straw is well matched. A long gentle fire dries the flesh before the scales ever set.
The guts come out afterwards, not before. Split open, the fish lets hot air into the cavity and dries from both sides at once. Left shut, the inside steams in its own water — and cleaning it is easier once it is cooked anyway.
Stand it up. Laid flat, the straw burns from underneath and the top half is smothered in ash. Upright, the fire wraps the whole fish as it climbs, and the fat and water run down the body towards the tail instead of feeding a flare underneath it.
Rolling it at the table is half the dish. The format is goi cuon's, and the smoked flesh is built for the astringency of green banana and the sourness of star fruit. Eaten on its own the fish is monotonous.

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