Chawanmushi with Crab and Shiitake (Japanese Steamed Egg Custard)

The standard is 1 part egg to 3 parts dashi, measured by weight or volume — weigh your shelled eggs and multiply by three. This gives the classic barely-set, trembling texture that defines chawanmushi. If you prefer something firmer that holds its shape more cleanly on the spoon, go to 1:2.5. Any thinner than 1:3.5 and the custard struggles to set at all. Since dashi carries almost all the flavour, use a good one — homemade kombu and bonito, or a decent instant.

Holes and a bubbly, spongy texture almost always mean the heat was too high. The water should sit at 80–90°C, barely steaming, not at a rolling boil — hard steam makes the egg bubble as it sets. The other cause is air: whisking the eggs vigorously beats bubbles into the mixture. Cut through the eggs with chopsticks instead, strain the custard, and skim any surface bubbles before steaming. Keeping the pot lid slightly ajar also helps regulate the heat.

Yes, if you want the silky texture chawanmushi is known for. Straining through a fine sieve removes the chalazae, the ropey white strands attached to the yolk, along with any unmixed egg and small bubbles. Skipping it leaves a custard that's noticeably grainy and uneven. It takes seconds and is the single easiest way to improve the result. Some cooks strain twice for an especially smooth finish.

Dashi is where nearly all the flavour comes from, so it's worth using. For a vegetarian or vegan-friendly base, kombu dashi or a shiitake-soaking dashi both work well and are traditional in their own right. At a push, an unsalted light vegetable or chicken stock will make a pleasant custard, though it won't taste distinctly Japanese. If going vegetarian, swap the crab and kamaboko for extra mushrooms, edamame, or blanched vegetables.

Insert a skewer into the centre: if the liquid that rises is clear, it's set; if it's cloudy, it needs a few more minutes. The surface should wobble as a whole rather than ripple like liquid. Chawanmushi keeps in the fridge in its cups for 1–2 days and is good chilled as well as warm — a chilled version is a summer classic. It doesn't freeze. To reheat, sit the cup in very hot water for about 10 minutes rather than microwaving, which makes it rubbery.