After black tea is boiled in a health pot, there is a circle of red at the bottom of the pot because different materials will change color after boiling. When boiling black tea in a health pot, put 10~ 15g black tea in the health pot, pour a proper amount of mountain spring water, and select the black tea function on the health pot to boil. I think the taste of black tea is a bit monotonous. You can wait for the temperature of black tea to drop, add honey, lemon juice and maltose, or cook it with milk.