Ground white peppercorns, a fine pale powder with an earthy, even heat. It goes into marinades and soups, and it is white pepper, not chili, that gives hot and sour soup its slow heat.
Hulatang soup must have white pepper powder added.
Tips
usage
In Chinese cooking 白胡椒粉 is used far more than 黑胡椒粉 (black pepper). It is essential to many soups and stir-fries because its pungency is cleaner and doesn't darken pale broths.