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Export 4 ingredients for grocery delivery
Step 1
Combine soy sauce, mirin and kombu in a small bowl.
Step 2
Gently add egg yolks to the soy-sauce mixture, cover and place in refrigerator to cure for six hours, up to two or three days. The yolks will firm up and darken over time, becoming quite hard in three days.
Step 3
Serve 1, 2 or 3 yolks per person, over steamed short-grained rice.