Prep the Canning Equipment: What all of your canning equipment (jars, lids, screw bands, and bands) in hot soapy water. Rinse well to get off all the suds. Place on a clean kitchen towel to dry.
Put the jars on a rack in a pot of water. Simmer (180˚F) for 10 minutes, and keep the jars warm until you are ready to fill them.
Prep the Garlic: Use whichever method you prefer to peel the garlics (you could one by one, blanch in boiling water, or cut ends off and shake them in a jar until peel comes off).
Make the Pickling Brine: In a medium saucepan, combine vinegar and salt.
Bring to a boil and reduce to a gentle simmer until the salt dissolves for 10 minutes (180 degrees).
Can the Pickled Garlic: While the brine is simmering, add the red pepper flakes to your jar (or jars).
Add in the garlic cloves, gently packing them. Leave ½-inch of headspace.
Begin to ladle out the hot pickling liquid and divide between the jar. Leave ½-inch of headspace. Use a clean kitchen towel (or paper towel)to clean the rims and seal the jars with the lids. Let the jars cool 5 minutes.
Wipe the top of the jar with a clean and damp kitchen towel, and then screw on the lid until it is snugly closed.
Get out the air bubbles: Let the jar cool completely and then turn it upside-down a few times, to let the air bubbles come to the top. Cool 12 hours. Check seals.
Store the jar: Place the jar in the refrigerator for at least 1 week prior to enjoying. The longer it stays in the refrigerator without opening, the better the flavor will be (2-4 weeks is ideal, if you can resist!).