Miso-Cured Egg Yolks

Raw egg yolks cured in miso until they go dense, translucent and amber - sliceable or gratable, tasting like a savoury caramel. The mechanism is osmotic dehydration: the miso’s salt draws water out of the yolk. It is exactly the process that ruins an over-marinated boiled egg, deployed on purpose. Over hot rice it is outstanding.

Ingredients

• 6 egg yolks, very fresh, separated cleanly
• 500 g white or awase miso
• 2 tbsp mirin (to loosen the miso)
• 2 tbsp sake (optional)
• Cheesecloth or muslin (optional but helpful)

Directions

Key ingredients

Mirin · Miso · Sake

1. Loosen the miso with the mirin (and sake if using) to a thick, spreadable paste - about the texture of peanut butter.
2. Spread half the miso in a flat container in an even layer about 2 cm deep. If using cheesecloth, lay it over the miso now - it makes retrieval far easier.
3. Make wells. Press the back of a spoon into the miso to make 6 shallow depressions, spaced apart.
4. Slide one yolk into each well. Be gentle - a broken yolk is a lost yolk.
5. Cover with the remaining miso, spooning it gently over so each yolk is fully enclosed. If you used cheesecloth, fold it over instead and then cover with miso.
6. Refrigerate 2-4 days. At 2 days they’re soft and jammy; at 4 they’re firm enough to grate. Longer goes harder and saltier.
7. Retrieve carefully, rinse gently if needed, pat dry.
8. Serve grated or sliced over hot rice, pasta, or steamed vegetables.

Notes

The mechanism

This is osmotic dehydration - the salt in the miso pulls water out of the yolk, concentrating it and firming the proteins. It is the exact same process that makes an over-marinated ramen egg rubbery and dense. Here, it’s the point.

Reusing the miso

The miso can be reused a couple of times but it gets progressively wetter and eggier. Use it in soup or a marinade afterwards rather than throwing it out.

Safety

These yolks are cured, not cooked - the salt and dehydration do the work, but this is a raw egg product. Use the freshest eggs you can get. Note that Salmonella can be inside an intact egg via vertical transmission from the hen, so this is not a zero-risk preparation and it is not one for pregnant, immunocompromised, very young or very old eaters.

⚠ An honest deletion

I’d intended to include umeboshi-cured yolks alongside these. NOT FOUND - no source in English or Japanese. It sounds plausible, which is exactly why I’m not writing it.