Separate egg yolks from egg whites and place them in a dish.
Cover the egg yolks with a mixture of soy sauce and mirin (85:15 ratio).
Cover the dish with a paper towel and let it sit in the fridge for at least 24 hours.
Use the soy cured egg yolks as a condiment or topping for rice, noodles, or onigiri. The longer they cure, the firmer they become.
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