The best place to savor northern style Chinese cooking (e.g. noodles, dumplings, dim sum, etc.) and there's always a new find if your explore every nook and cranny.
Try the local cafes. There's Mezzanine Cafe, all proceeds go to the nearby fire station. Lots of local Chinese groceries as well with huge international items selection.
This is one of my go to Chinese Restaurants whenever I get to visit Ongpin Street. For me, they serve one of the best 'Kiam Pung' rice in all of Chinatown.
Visit Dong Bei Dumplings! Great food, yummy dumplings! You can even order frozen packs! It's at the very end of Yuchengco Street near San Lorenzo Ruiz Academy