*Gobo is a (somewhat absurdly) long, thin, fibrous root that is chock full of toasty, earthy flavor with a slight bit of sweetness that develops when cooked. Also called burdock root, you can find gobo in Japanese, Chinese and Korean grocers.
**I buy thinly sliced meats from a Korean or Japanese grocer. They are sliced almost paper-thin and high quality (i.e., a small amount lends a huge amount of flavor). If you don’t have access to this kind of meat, a small amount of ground beef or chicken might work instead.