This is one of my very favorite winter time dessert soups, actually it's the only dessert soup I ever eat or make. It's very Japanese, very sweet and never fails to make me smile. I'm basically lazy, so I use this method that starts with pre-packaged koshi-an (my favorite) or tsubushi-an. Basically, it's a very thick sweetened red bean soup that has rice cakes in it. Serve it with pickled plums (umeboshi) to cut the sweetness, if you need to. It comes together very quickly if you are using prepackaged red beans.