This simple steamed dish is always a big hit when I serve to my guests, and everybody loves watching the process of making it, too. When the potatoes and green beans are steamed in donabe, they tend to retain both the nutrients and texture, while the flavor becomes so rich and pure. To make the sauce, the sesame seeds are first roasted in horoku (sesame roster) until fragrant, then they are ground in suribachi and surikogi (Japanese mortar and pestle) and mixed with seasonings. The steamed vegetables are added directly to the sauce in the suribachi and tossed together. And, you can serve it right out of it at the table. Sesame and peanut butter add nice richness to the dish. For the sauce, I normally add leftover dashi (either kombu & shiitake mushroom dashi or kombu & bonito dashi) for extra subtle layer of flavors, but you can totally go with just water, if you don’t have dashi and it would still taste delicious.