Oriental Soup House is a hopping Vietnamese restaurant in Újlipótváros, a residential neighborhood a bit outside the city center. As soon as you enter, you'll notice the Asian cooks scurrying behind the open kitchen, always a good sign for a Vietnamese restaurant. The menu features 11 types of soups, of which the traditional beef pho (pho bo; €6) with a gleaming, flavorful broth is among the best I've had in Budapest, especially if you get it with thinly sliced tenderloins that quickly cook through in the steaming broth.
The bun cha, grilled pork patties with springy rice noodles and a profusion of fresh herbs and vegetables, is wonderfully refreshing (€6). Round out your meal with a Vietnamese chè dessert (€3), which is a luscious tapioca pudding with mango and pomegranate seeds.
Oriental Soup House is wildly popular, so try booking in advance. (If you don't, you may have to sit at one of the long communal tables in the middle of the space on backless wooden stools.) After your meal, roam around the neighborhood, known for its modernist buildings from the 1930s and 1940s, especially those along Pozsonyi Road, the main artery of the area. Note that Oriental Soup House has another location in downtown, but this one draws more locals.