Question

sometimes yoghurt brcomes bitter and froths up why does this happen?​

Answer 1

what is this question I don't know .. sorry

Answer 2

Curd can taste bitter sometimes if the the fermentation is in excess than the required amount.During the fermentation process the lactose present in the milk is converted to lactic acid under ambient environmental conditions.When the optimum consistency is reached it has to be refrigerated to stop the fermentation