Put one leaf on the bottom of a quart mason jar.
Fill the jar with carrots, garlic, pickling spices.
Put pickle or sauerkraut juice, if using.
In a separate pint jar, shake salt and water until salt is dissolved (this is your brine).
Pour the mixture over the carrots so that the carrots are completely covered with brine. Leave 1.5 inches between the top of the liquid and the lid.
Cover tightly and leave on the counter for 3-5 days, or until you stop seeing active bubbling. Burp daily (to allow gases to escape).
Keep in the fridge for up to a year.