Sweet and savory hoisin glazed mushrooms, creamy kewpie mayo, nutty toasted sesame seeds, and bright cilantro come together between two pillowy steamed buns. Traditionally made with pork belly, this version of bao is not only vegetarian-friendly but even meat lovers will dig its umami richness. Oh, and fyi, this recipe is written as if you've got frozen steamed buns on hand-however, you can also make them yourself.