1.) get a stick of butter and cut a slab off.
2.)Rub the cut section of the leftover onion with the butter. Soften the butter ever so slightly if you need to, by letting it sit at room temperature for a few minutes.
3.) Place the onion on foil and wrap it tight.
4.) then place in a tupperware dish to keep you fridge from smelling like onion
5.)Store the onion in the refrigerator, the butter will act as a barrier and prevent the outside air from drying out your onion.
Here is another good reference
http://www.ehow.com/how_8111893_store-cut-onions-refrigerator.html
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