1. How To Thinly Slice Onions
Thin Onion Slices:
To chop and slice an onion, first you must slice off the top of the onion.
Next, trim off the root end
Stand the onion upright on one of the flat ends you just trimmed and slice it in half.
Peel both halves of the onion.
Lay the flat end of the halved onion on the cutting board. You'll be slicing root to top, so orient the onion for this (especially if you left the root end intact).
Angle your knife slightly inwards (toward the middle of the onion). Starting at one end of the onion, slice toward the middle--you don't need to go all the way through to the middle with the first few cuts. Gradually increase the angle as you move toward the middle.
Once you get to the center, stop, and rotate/tip the onion over (so the half that was the middle is now face down on the cutting board). Now you can slice the second half of the onion the way you sliced the first.
Check out this Youtube tutorial on how to slice an onion for expert details.
2. How To Dice Onions
Slice off the top end. Leave the stem end intact.
Place the onion on the flat, cut surface and slice it in half.
Peel the skin.
Place the large, flat surface to the board. Make horizontal slices, from the top end towards the root end. Do not slice through the root--keep this intact.
Turn the onion and make vertical slices, from the root end toward the top. Continue to keep the root intact.
Turn the onion again and make vertical slices again, this time perpendicular to the slices you just made.
Check out Serious Eats for step-by-step pictures and instructions.
3. How To Slice Onion Rings
Slice off the top end and peel off the outer skin.
Slice the thinnest sliver from one side of the onion. This will provide a stable base for slicing rings. Place the onion on the cutting board with this side facing down (the side that you cut the sliver from).
Slice the onion vertically to whatever thickness you desire (thicker is better for frying onion rings, thinner is better for salads and sandwiches).
Check out Simply Recipes for pictures and step-by-step instructions.
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