Grapefruit rinds can be used to make a fiber-rich tea. Banana peels can be used to give your shoes an extra shine. Visit Insider's homepage for more stories.

An American scientist has suggested adding salt and even grapefruit to tea - but they're not the most bizarre ingredients people have been adding in the quest for a perfect cuppa.

To make the most delicious and nutritious tea, simply add a grapefruit peel to boiling water and let it simmer for 15 minutes, then sweeten to taste with honey.

The controversial American chemistry professor who told us to add salt to our tea is now advising drinkers to combine it with grapefruit to lengthen its caffeine buzz. Professor Michelle Francl ...