Pestle Rock was the best Thai restaurant in Ballard. Until its owners opened a megacasual Southeast Asian noodle bar next door, where so much happens inside each fortifying bowl, like the guay tiow khaek, a seafood soup with fat, square noodles in a rich coconut curry broth that snaps with chili oil. If the build-your-own-adventure combinations seem daunting, head straight for the ba mee giow muu dang, a clear, porky broth full of leaner-than-usual barbecue pork atop egg noodles and a few of Sen’s excellent dumplings.