How to Slice Scallions: A Complete Guide to Professional Cutting Techniques

Preparation and Cleaning

Start by rinsing the scallions thoroughly under cold running water for at least 30 seconds, gently rubbing each stalk between your fingers to dislodge any dirt or grit trapped between the layers. Pay special attention to the white bulb end, where soil often clings. Pat them dry with a clean kitchen towel or paper towel—moisture on the surface will cause the knife to stick and produce ragged cuts. Place the scallions on a stable cutting board (a damp paper towel underneath the board prevents slipping) and trim off the stringy roots at the base, cutting just above the root cluster—about 1/8 inch up—to keep the bulb intact. You should also trim about a half-inch off the very tips of the green ends if they appear wilted, discolored, or slimy; if the tips are crisp and bright green, leave them on. Discard any outer layer that is bruised or translucent. For best results, use scallions within 2 days of purchase; older scallions become limp and lose their snap.

The Classic Round Cut

For standard garnishes in soups, tacos, or baked potatoes, gather a few scallions (3 to 4 at a time) into a neat bundle, aligning the white bulbs and green tops. Hold the scallions with your non-dominant hand using the 'claw' grip: curl your fingertips inward so your knuckles guide the knife blade, keeping your fingertips safely behind the knuckles. Using a sharp chef's knife or Santoku (an 8-inch blade works best), make straight, downward cuts perpendicular to the length of the onion, spacing each cut 1/4 inch apart for a standard garnish or 1/8 inch for a finer finish. This creates uniform, circular rings. You can use both the white and green parts, though the white parts are more pungent and hold up better in cooked dishes; the green parts are milder and best used raw. If the rings fall apart, your knife is dull—sharpen it on a 1000-grit whetstone before continuing. For a more even cut, rock the knife blade forward as you slice, keeping the tip on the board. You should hear a clean, crisp crunch with each cut; if you hear tearing or squishing, the blade is too dull or you are pressing too hard.

The Elegant Bias Cut

The bias cut, or diagonal cut, increases the surface area of the onion by about 40% and adds sophisticated visual interest, making it the preferred choice for stir-fries and salads. Hold your knife at a 45-degree angle to the scallion—you can use a small protractor or simply eyeball the angle by tilting the blade until it forms a diagonal line across the stalk. Slice downward, maintaining that consistent 45-degree angle as you move down the stalk, making each cut 1/2 inch apart for stir-fries or 1/4 inch for salads. The result is elongated, oval-shaped pieces that provide more texture and coverage on a plate. To keep the angle steady, rotate the scallion a quarter-turn after every 3 to 4 cuts; this prevents the stalk from rolling and gives you a more uniform shape. If the pieces come out uneven—some long, some short—you are changing the angle mid-cut; practice by drawing a 45-degree line on a piece of tape and sticking it to your cutting board as a guide. For a dramatic presentation, cut the white bulbs on a steeper 60-degree angle and the green tops at 45 degrees; the contrast in shape and color makes the dish pop.

The Fine Shred or Julienne

Often used as a delicate garnish for ramen or steamed fish, this technique creates beautiful green ribbons. Cut a section of the green stalk into 2-inch lengths—use only the dark green parts for the best color and texture; the pale green and white parts are too firm and will not curl as nicely. Slit each section lengthwise with a paring knife, then open it flat against the cutting board with the inner surface facing down. Slice as thinly as possible into long, hair-thin strips, aiming for a thickness of 1/16 inch or less—if the strips are thicker than 1/8 inch, they will not curl properly. To make these strips curl into elegant spirals, soak them in a bowl of ice water (add 4 to 5 ice cubes to 2 cups of cold water) for 5 to 10 minutes before serving. The cold water causes the cell walls to absorb moisture and expand, creating tight curls. If the strips do not curl after 10 minutes, the water is not cold enough—add more ice and wait another 5 minutes. Alternatively, if you are short on time, you can skip the ice bath and use the shreds as straight, flat garnishes; they will still look elegant on a plate. For a variation, toss the soaked and drained shreds with 1 teaspoon of rice vinegar and a pinch of sugar to add a subtle tang that complements rich broths.