Wagyu Ramen & Hamburger (Halal Vegan Gluten Free) Dotonbori is in Dotonbori, Osaka, and serves wagyu hamburgers and wagyudon. The wagyu hamburger uses tender meat, and the wagyudon comes with a sweet and salty sauce. For the wagyudon, you break the egg yolk and mix it with the rice and meat, and a fire show is part of the meal. Prices are on the higher side.