Share Polygonum Multiflorum Black Rice Egg Soup Recipe Cooking Time: 100 minutes Main Soup China Tips 1. Polygonum multiflorum, black dates, rhizoma polygonati may mix with sand and mud, make sure clean through before stewing. 2. You can use quail eggs, duck eggs or any... Sophie January 30, 2020 Like 1 Read More Comment 9,559 Views