How to make cold mixed longbeet

1. dry longbeet is like this~~

2. longbeet soak, about 2 hours can be

3. 1 tablespoon of rice vinegar, 1 tablespoon of soya sauce, 1 tablespoon of chili oil, appropriate amount of large onion and scallion (taste), small onion and scallion (color) and pepper water (made of boiled water soaked peppercorns), a little salt and white sugar