It's not so hard to do it at home: first, to handle the red potato powder, to make it smooth, not sticky; second, to have a spicy, secret pepper oil; third, to make the bottom of the soup; fourth, to prepare the ingredients, the dishes; and, finally, the sour spicy, to adjust it to your own tastes — that's all ready, three minutes, a bowl of sour, a bowl of sour spicy, an addictive sour powder