Food Safety Report: H Mart Diamond Bar, South Diamond Bar Boulevard, Diamond Bar, CA, USA 4 years ago • details 40 Comments Comment Wei-Chuan Beef and Green Onion Dumplings, bought some frozen dumplings to have with my soup. first day: diarrhea 9 hours later. Ahh i guess it was the leftover soup. Second day: try dumplings again. Diarrhea 9 hours later. I am very regular and only shit in the morning.