home cooking: Wagyu Roast Beef with Onion Shoyu Sauce Donburi (和牛ローストビーフ玉ねぎ醤油ソース丼) Wagyu Roast Beef Donburi is a recent invention of Paku and it kicks! This novel donburi features fine wagyu (Japanese beef) roast beef, on a bed mugi genmai gohan (barley brown rice) and fresh mizuna and topped off with a shoyu based onion sauce.…