Fermented Soybeans Tua Nao originated from ”Tai တႆး” (ไทยใหญ่ Shan people) who inhabit the Myanmar and Thai territories of the north-western part of the Kingdom. Making both types of Tua Nao starts with the boiling of soybeans in brine for 4-6 hours. The soft beans are then pounded smooth in a wooden mortar and pastel and left to ferment for 2-3 days. Before using Tua Nao in food preparations the cakes are lightly grilled and pounded to a fine powder.