Place the peeled garlic cloves in a quart mason jar, leaving 2-3 inches of space at the top.
Pour the sauerkraut juice over the garlic.
In another jar, dissolve the salt in 1/3 cup of hot water. Once the salt has dissolved, add the rest of the water cold to the jar to cool it down.
Pour the saltwater into the jar with the garlic, covering all of the garlic and leaving about an inch of space at the top.
Place a fermentation weight on top of the garlic and screw on the lid.
Put the jar in a dark location between 65 and 70 degrees. Burp the jar once a day to release pressure caused by fermentation.
Ferment the garlic for 3-8 weeks, depending on your taste preference. The longer it ferments, the milder the flavor will become.
Once it's done fermenting, store in the fridge.