The Fields Corner neighborhood of Dorchester is filled with exceptional Vietnamese restaurants. But for its skill with dishes beyond the usual pho and vermicelli, Anh Hong rises to the top. Take the vinegary jellyfish-and-shrimp salad, a perfect balance of tangy and sweet. Then there’s the beef fondue trimmed with Granny Smith apples and fish mint, which you can use to make your own fresh rolls. And the pineapple-ginger sauce that comes with that tender beef? We’d put it on everything if we could.