1, in fact, it is ok to add milk to black coffee, because milk and black coffee are both conventional drinks, and they do not contain irritating substances and ingredients. The main substance is water, which can be eaten together, but it will destroy the original flavor of black coffee, and some people are not used to drinking it.
2, black coffee and milk brewing should also pay attention to a certain method, first pour black coffee into a clean brewing pot, then pour hot milk into another brewing pot, the ratio of the two is 1: 1, and then pour coffee and milk into the cup at the same time, and the outflow can be consistent.