Every time we eat sushi, we have to have at least one order of Uni, otherwise known as Sea Urchin. While it is not for everyone, it is recommended that you try it at least once, if you truly love sushi. It's like a firm custard, but it is very rich and buttery. A common misconception about uni is that it is actually the roe of the Sea Urchin. In fact, the Uni that we eat in sushi consists of the gonads of Sea Urchins. The gonads produce the roe for this prickly sea creature. There you go. You learned something today. Now order a couple of orders for yourself. You deserve it.