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How to julienne carrots 
Chop the carrot in half. 
A whole carrot is usually too cumbersome to julienne, so it helps to cut your carrots into smaller pieces. Use a sharp chef's knife to slice the carrot in half horizontally.
If a carrot is particularly long, you may want to cut it into three or four pieces. You'll have the easiest time julienning pieces that are approximately 3-to 4-inches (8 to 10 cm) long or smaller.