A thick soup of thin, coin-shaped slices of salted and dried cuttlefish egg gland, soured with vinegar and made hot with white pepper, not chili. 乌鱼蛋 is not roe. A Shandong dish.
When you eat out in Qingdao, a bowl of cuttlefish egg soup is just right to finish the meal.
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乌鱼 here is the cuttlefish, and 乌鱼蛋 is not roe but the female cuttlefish's egg-producing gland, salted and dried. It comes apart into thin, coin-like slices when cooked.