A chef's knife, with its long, broad blade and slightly curved edge, is the best choice for achieving a precise dice on vegetables like carrots or potatoes due to its versatility and ability to rock smoothly.
A chef's knife is the workhorse of the kitchen and excels at dicing vegetables for several reasons. Its blade length (typically 8-10 inches) provides ample surface area for guiding the knife along the cutting board. The slight curve of the blade allows for a rocking motion, which is crucial for efficient and consistent dicing. This rocking motion allows you to keep the tip of the knife in contact with the cutting board while moving the blade up and down, creating uniform cuts. The broad blade also provides knuckle clearance, preventing your fingers from hitting the cutting board as you chop. To dice effectively, first square off the vegetable by trimming the sides. Then, cut the vegetable into planks of the desired thickness. Stack the planks and cut them into sticks (julienne). Finally, line up the sticks and cut them crosswise into uniform cubes (dice).
Maintain a sharp edge on your chef's knife. A dull knife is more dangerous than a sharp one because it requires more force to cut, increasing the risk of slipping and causing injury. Sharpen your knife regularly with a honing steel or whetstone.