Passover Tori Tsukune Nabe (Japanese Chicken Meatball Hot Pot)

warm (but not boiling) water

large dried shiitake mushrooms ((.75 ounces))

ground chicken

large egg

leek, white and pale green part, finely chopped

fresh grated ginger

fine sea salt

chicken stock

small napa cabbage, roughly chopped ((core removed and discarded))

medium carrot, cut in half lengthwise, then cut into slices crosswise ((half-moon shape))

cremini mushrooms, sliced

freshly ground black pepper