| Clue | Source | Date |
|---|---|---|
| Peking duck sauce | USA Today | 07 Feb 2021 |
| Dark Chinese sauce | Wall Street Journal | 02 May 2018 |
| Dark Chinese sauce | ||
| Sauce served with mu shu pork | LA Times Daily | 07 Oct 2016 |
| Sauce served with mu shu pork | ||
| Sauce: in oriental city not an offence |