The boiled water (100oC) is brought to the appropriate temperature for that yeast to function as 10 - 15oC. This temperature will depend on the kind of yeast and the kind of beer. Saigon (also formally often known as Ho Chi Minh Metropolis or domestically in Vietnamese as Sài Gòn) https://kameronvquts.targetblogs.com/30707550/sai-gon-fundamentals-explained