01 of 06
Start With Firm, Smooth-Skinned Onions
The better the onions, the better the slices.
Start with onions that have smooth skins, feel heavy for their size, and are supremely firm.
"Freshness" isn't so much the issue, since onions are excellent storage vegetables, as is looking for onions that have been stored properly, after having been "cured" or lightly dried before being stored in a cool, dark place.
One note if you're working with more than one onion: do as the pros do and do each step with each onion before moving on to the next... step. Amazingly, it really does save time.Continue to 2 of 6 below.
02 of 06
Cut Off the Stem End
The other key to perfectly sliced onions is to use a very sharp knife. Some people will worry that a sharp knife is dangerous, but a sharp knife is actually safer—it will cut where you want it to cut instead of slipping off the surface and cutting something else (like your finger!).
So, using a very sharp knife, cut off and discard stem end, being careful to hold the onion steady as you do so.Continue to 3 of 6 below.
03 of 06
Halve the Onion
Set the onion on a work surface on the flat cut end to keep it steady and cut it in half lengthwise (down through the root end), using the intact root end to hold each half together.Continue to 4 of 6 below.
04 of 06
Remove the Onion Skin
Peel the onion, removing any and all of the papery skin and even the external layer of onion if need be to get all of the skin off.
If you tear up from onions easily or the onion at hand has a particularly clingy peel, you can do this under running water. The water will wash away the sulfur that causes the tears and get between the onion and the peel, making the latter easier to remove.Continue to 5 of 6 below.
05 of 06
Slice the Onion
On the work surface, lay the onion on its large flat side, hold it carefully by the still-intact root end, and use a very sharp knife to slice the onion as thick or as thin as you like.
Push the onion slices aside and repeat with the second half.
I like to keep the tip of the knife down, lifting and pressing down the knife handle in almost a rocking motion rather than hacking away lifting the entire knife up and down, but both methods have their fans.Continue to 6 of 6 below.
06 of 06