Yusuke made this hot pot or nabe dish using some very special dashi that was given to us by a Japanese classmate in my French class. Dashi as a general category is a soup stock around which much of Japanese cuisine is based. This particular batch consists of dried shitake, katsuo (bonito in English, aka skipjack tuna, or so Wikipedia tells me), kombu (a type of seaweed), and tiny little fishies called niboshi (baby sardines: see below!). Dashi is generally made from boiling these items and draining off the resulting broth, but sometimes we eat it with whole pieces of the ingredients as well.
For this dish, Yusuke boiled fresh nappa, generous chunks of tilapia, bean sprouts, and big green onions in the dashi broth and added soy sauce, salt, and mirin to taste. I’m still not entirely clear on the distinguishing characteristics of nabe, but you can read more here.
I had my second portion of this lovely dish for lunch at work, and I added some of the fresh mochi that we had picked up from the Montreal mochitsuki (mochi-making festival). You can just lay the mochi on a plate, add a few drops of water, and microwave it for 30 seconds to make it good and sticky for adding to a soup. But I have to be careful about over-microwaving: it undergoes a similar expansion phenomenon to marshmallows. Very fun, but potentially very messy!