From a classic culinary school method to tool-specific techniques like using a box grater or mandoline, here’s how professional chefs slice and dice onions to perfection.

Prep onions with confidence, whether you’re using a chef’s knife, mandoline, or box cutter. Whether they play a supporting or starring role, onions are the all-purpose flavor agent of the kitchen.

Whether they play a supporting or starring role, onions are the all-purpose flavor agent of the kitchen. They can be bold when sliced thin and served raw as a burger topping, or silky and sweet when ...