Ripening techniques

All of my fruits naturally ripen without  adding any chemicals or any other inputs.
At most some plants and hay can be used for increasing uniform ripening of fruits.

Our old technology used by our ancestors is still healthy and gives 100% result.

Dear Members, can you come up with indigenous knowledges for ripening of fruits naturally? 

I read ripe bananas placed together with the fruits to ripen enhance the ripening due to release of ethylene.