How to Get that Onion Smell off your Hands
Rref: St. Petersburg Nutritionist
While an onion begins many meals in almost every cuisine, the onion, and the entire Allium family, (which includes leeks, shallots, garlic and chives) contains a redolent juice than lingers longer on the fingers (and cutting board) than it does on the tongue.
There are several ways to get rid of the smell. Rub your fingers with lemon juice, vinegar or another acid or try rubbing your fingers against a stainless steel bowl which alchemizes the odor.
My personal favorite way to rid my fingers of onion is to rub them in coffee grounds which completely neutralizes the smell. When my cutting board gets a little onion-y funky, I smear coffee grounds into the cutting board. The odors are eliminated immediately.