Unadon (unagidon) is simply made with grilled eel served over rice and coated with unagi sauce, donburi dishes are usually served in ceramic bowls. Hitsumabushi contains the same ingredients (eel, rice, unagi sauce) but it's always served in a wooden bowl or container. The rice is also mixed with the unagi sauce and it is always served with a variety of toppings and a hot broth made with dashi / green tea.