During the Second World War, the United States strictly implemented the rationing system, and each person could only drink one cup of coffee a day  One day, Roosevelt told reporters at a press conference that he had drunk one cup of coffee in the morning and another in the evening  After listening to this, the reporters immediately asked, we each have only one cup of coffee a day  How can you get two? many reporters thought it was a big news on the front page  Facing the censure of reporters, Roosevelt replied without emotion: I do drink a cup of coffee in the morning and evening  However, in the evening, I cook the coffee grounds cooked in the morning again
Since then, people call the coffee brewed after boiling Roosevelt coffee
Origin of Roosevelt coffee