How do you keep bananas from turning brown?
Eat them. Bananas continue to ripen after being picked. They are
considered to be ideal when a few brown spots appear, although many
people prefer green bananas and over-ripe ones.
DO refrigerate them, if they are browning faster than you can
eat them- the skin will darken but the fruit will stay fresher
longer. To slow ripening, don't store bananas with other fruit- ie
the typical fruit basket or bowl is not a good idea for bananas, as
they ripen too fast.