Otoshibuta

Here's another amazing dish I cooked during my recent session with Chef Isao Yamada. I asked him to teach me a method for sardines, a delicious (and sustainable) fish that I feel more of us should be eating.

An amazing thing happened when I watched Chef Isao Yamada simmer ingredients in the Japanese way, a technique called nimono. When the simmering liquid started to boil, he laid a lid, a wooden lid smaller than the saucepan, directly on top of the cooking ingredients. The liquid immediately started boiling up, but then he adjusted the heat, and it calmed down, happily bubbling away under that lid. What was going on here?