Trim the tips off the carrot or other vegetable you are planning to julienne. Lay the vegetable on the cutting board, on an angle, holding the thicker end. Thinly slice the veggie into thin diagonal pieces. If your knife is sharp, the slices will fall onto themselves, resembling fallen dominoes. You may need to rearrange the slices slightly to achieve this effect as you practice. Once the vegetable is sliced, hold the overlapped pieces in place with your hand, spreading your fingers to hold as many of the pieces in place as possible. Cut lengthwise across the pieces to create long, slender matchsticks.