Chawanmushi (茶碗蒸し) — Steamed Dashi Egg Custard

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// OPERATIONS

1. 1 Wipe the 8 g of kombu with a barely damp cloth and never rinse it — the white bloom on the surface is mannitol and glutamate, which is the flavour you are paying for. Put it in a 2 litre saucepan with the 700 ml of cold water and soak at room temperature for 60 minutes, or in the fridge overnight. Do not reach for granulated instant dashi here: chawanmushi is three quarters dashi by weight and there is nothing in the dish to hide behind — a genuine dashi pack of real katsuobushi and kombu is the only substitute worth making, and it is entirely normal in Japanese homes.
2. 2 Set the pan over the lowest heat and bring it to 60-65°C / 140-149°F over about 10 minutes, then hold it there for 20 minutes; the water should steam faintly and never bubble. Let it climb to about 80°C / 176°F — fine bubbles clinging to the sides of the pan, no movement on the surface — and lift the kombu out with tongs. Boiled kombu turns slippery and pushes a sulphurous, low-tide flavour into the dashi that you cannot season out.
3. 3 Raise the heat until the surface just shivers at 85°C / 185°F, take the pan off the heat, scatter the 20 g of katsuobushi over the top and leave it for 90 seconds, until the flakes have sunk. Strain through a sieve lined with damp muslin and let it drip on its own — never press or squeeze the flakes, which releases bitterness and turns the dashi cloudy. You should have 480-520 ml of clear pale-gold liquid.
4. 4 Measure exactly 450 ml of the hot dashi into a bowl and stir in the 1 tsp usukuchi soy, 1 tsp mirin and 1/2 tsp fine salt while it is still hot, so they dissolve evenly instead of settling out. That lands the finished custard at roughly 0.7% salt — it should taste like a clear soup pulled up slightly short, not like a sauce; a second teaspoon of soy tips it into salty and stains the pale custard beige. If the raw alcohol in the mirin bothers you, simmer that teaspoon on its own for 10 seconds first, because stirring it into 85°C dashi will not drive it off. Cool the seasoned dashi to below 40°C / 104°F, either by sitting the bowl in iced water for 10 minutes or leaving it on the counter for 30; dashi much above 60°C / 140°F sets threads of egg the instant they meet, and no sieve will take them out again.
5. 5 Toss the 80 g of diced chicken thigh with the 1 tbsp of sake and a pinch of salt and leave it 10 minutes. Bring a small pan of lightly salted water to just below a simmer, about 90°C / 194°F, and blanch the chicken for 30 seconds, the prawns for 20 seconds until just opaque on the outside and still translucent in the middle, and the shiitake for 30 seconds; drain everything on kitchen paper. The blanch is not fussiness — raw chicken weeps grey juice into a pale custard, and unblanched prawn releases water that stops the custard setting cleanly around it.
6. 6 Divide the solids between four lidded chawanmushi cups of at least 240 ml capacity (deep ramekins or thick teacups work): chicken and shiitake on the bottom, kamaboko and two ginkgo nuts against the sides, and a prawn leaned tail-up against the wall where it will show. That is about 50 g of solids per cup, and with 145 ml of custard poured over it each cup carries close to 200 ml — a 180 ml teacup will overflow, so check the capacity of yours with water before you commit. Do not crowd them either: the custard needs room to set around each piece, and an overfilled cup gives you a broken, cratered set with the heavy pieces sitting on the bottom. Two ginnan per cup is the traditional number and is fine for adults, but ginkgo nuts are not something to give small children in quantity.
7. 7 Crack the eggs into a bowl and weigh them: you want exactly 150 g of beaten egg to your 450 ml of dashi, which is the traditional 1:3 ratio — three large eggs run anywhere from 150 g to 190 g shelled, so beat first and pour off the excess rather than trusting the count. Break them up by dragging chopsticks flat along the bottom of the bowl in a sawing motion for about 30 seconds, cutting the whites rather than lifting them. Do not whisk and do not lift the chopsticks clear of the mixture — every bubble you beat in becomes a permanent hole in the finished custard.
8. 8 Pour the cooled dashi into the eggs in a thin stream, stirring gently with the chopsticks still on the bottom of the bowl, then pass the mixture twice through a fine mesh sieve into a jug. This catches the chalazae and the ropy unbroken albumen, and it is the single dividing line between a silky custard and a granular one — no amount of careful steaming will rescue an unstrained mix, so do not skip it.
9. 9 Fill each cup to within about 2 cm of the rim, roughly 145 ml, pouring gently down the inside wall so you do not dislodge the prawn. Drag a strip of kitchen paper flat across each surface to lift off every last bubble, or briefly touch them with a kitchen torch. Cover each cup with its own lid, or with a square of foil crimped tightly around the rim, so condensation cannot land on the custard and pit it.
10. 10 Put 3 cm of water in a wide pot of at least 24 cm with a steamer basket, or improvise with a folded tea towel and an upturned plate, and bring it to a rolling boil. Wrap the pot lid in a tea towel, tying the corners on top — drips from a bare lid pit the surface of the custard like rain on sand. Set the cups in so they are not touching each other or the pot wall.
11. 11 Steam at full boil for 3 minutes to set the surface, then drop the heat to the lowest setting that still gives visible steam and prop the lid open by a chopstick's width, holding the pot at 85-90°C / 185-194°F, and steam for a further 12-14 minutes. Hold your nerve on the low heat: above about 90°C / 194°F the egg proteins boil rather than set, and you get 'su' — a honeycomb of holes weeping grey water. It is the one failure in this dish that cannot be undone.
12. 12 Nudge a cup with a fingertip — the surface should wobble as one solid mass, not ripple like liquid. Slide a bamboo skewer in at the edge and watch what rises: clear pale-gold dashi means it is set, cloudy yellow liquid means it is not. If it is cloudy, steam another 2 minutes and test again.
13. 13 Lift the cups out and rest them, still covered, for 2 minutes so carryover heat firms the centre. Lift each lid, lay a knotted mitsuba sprig and a sliver of yuzu zest on the surface, replace the lid and serve straight away, piping hot, with a small spoon — as a course in the middle of a Japanese meal, or alongside rice, grilled fish and miso soup. In Nagasaki it arrives rice-bowl sized and is eaten with mushizushi, steamed vinegared rice, on the side; the version with udon coiled underneath is odamaki-mushi, a Kansai dish rather than a Nagasaki one. In high summer it is also good chilled for 3 hours and served cold, still in its cup.

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