This method had been tested by many people, and found to be one of the best methods to help stop a cough.
Firstly cut off the top part of the orange, use a fork and poke the fresh then put some salt (about 1/2 tsp) into the orange, and place back the top part use a toothpick to secure it from dropping out. Steam it for 20 minutes and eat all the flesh, including the juice at the bottom of the bowl. May not taste very nice, but supposedly cures your prolonged cough in days.