Combine vinegar, water sugar, salt, peppercorns and mustard seeds. Cook until sugar and salt dissolve.
Pack cabbage and garlic into a clean 16 ounce mason jar. Pour brine over the top. You may not use all of it. I do like to make sure that I add all of the peppercorns and mustard seeds though. Screw lid on jar and refrigerate for at least 1 hour.
Notes
This recipe is not for canning. The cabbage must be kept in the refrigerator. For best results use within a couple of weeks. Nutrition information for estimation purposes only.