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Home Β» Cooking Basics Β» How to Cut an Onion

June 2, 2020 (last updated March 18, 2021)

How to Cut an Onion

(with minimal tears)

How to cut an onion with minimal tears. Is it possible? The answer is yes, so put away the tissues and follow these simple rules and steps.

Be sure to check out more of my cooking lessons and time-saving kitchen tips.

close up shot of pile of peeled red and white onions with blurry green leaves in background

Rule #1

The “experts” say store your onions at room temperature. I’m sure there’s a good reason for that but I know that a warm onion is a sure path to fast tears. Those oniony fumes are slowed down when the onion is cold. If you still prefer to store your onions at room temperature, I suggest putting them in the refrigerator for at least 6 hours before cutting.

Rule #2

The fewer times your knife touches the onion, the better. Most people cut the onion into slices or quarters and then start banging at it with the knife. Another sure path to tears.

So refrigerate your onions, be efficient with your knife cuts and get it to the size you want with as few cuts as possible. Here’s how it’s done . . .

How to Dice an Onion (see below for onion rings)

Time needed: 2 minutes

How to Dice or Mince an Onion

  1. Trim the root

    Trim a thin sliver off the root end leaving some of the root visible. You’ll leave some of the root so that the onion does not fall apart while cutting. Just trim enough to cut off the dirty, stringy roots.peeled red onion with root end trimmed on wood board

  2. Trim the stem

    Trim off the stem end.red onion on cutting board with stem end trimmed off

  3. Cut in half

    Place the onion on the cutting board root side up and cut it in half, cutting through the center.whole red onion on cutting board with knife cutting through root end

  4. Peel

    Place one of the halves on the cutting board cut side down, slice a slit from stem to root and peel off the papery outer layers.

  5. Do not cut through the root end

    Place one of the halves on the board, cut side down. Begin making cuts starting from about 1/8″ below the root all the way towards the stem end. DO NOT CUT THROUGH THE STEM. The idea is keep the onion held together. This will make the next step much easier. Follow the next steps, but notice in this photo that the knife cut did not go to the root.half red onion on cutting board with slits cut

  6. Lengthwise cuts

    Follow the contour of the onion by starting at one side with the knife parallel to the cutting board.half red onion on cutting board with knife cutting into it

  7. Continue to slice following the contour

    Angle the knife to 90 degrees as you reach the middle. half onion on cutting board with knife cutting slits

  8. Continue slicing

    Then angle the other direction until the final cut is about parallel to the cutting board.half red onion on cutting board with knife cutting into it

  9. Curl fingers

    Then use your non-knife hand, with fingers curled, to hold the onion steady.half onion with slits cut on cutting board with curled fingers holding steady

  10. Cut across

    Then start cutting across starting at the stem end.half red onion on cutting board with knife cutting into it

  11. Finish

    When you get close to the root end, lay the remaining piece with the root up and cut this way.onion on cutting board being diced

diced red onion on cutting board with knife blade on left

How to Slice an Onion into Rings

Trim a thin slice off the stem end and root end leaving some of the root intact so that the onion holds together.

red onion on cutting board with stem end trimmed off

Cut a thin slice off one side of the onion. This will create a flat surface to lay the onion on the cutting board so that it will be steady.

red onion with slice cut off on wood cutting board
whole red onion on cutting board

Curl your fingers of your non-knife hand to hold the onion steady and cut straight down to create rings.

how to cut an onion into slices - onion on cutting board being cut into rounds
round slices of red onion on cutting board
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Posted In: Cooking Basics · Tagged: cooking lesson, how to

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