Clean and trim beets, leaving just a bit of stem
In a pot of water, Cook beets until barely tender. Run under cold water until cool enough to handle.
Peel and slice beets into 1/4 inch thick slices. The peel may just slide off, alternatively use a peeler.
prepare pickling liquid, combine vinegar, sugar, water, salt and pickling spice in a nonreactive Dutch oven.
Bring mixture to a boil; reduce heat and simmer 10 minutes. Add beets to liquid; return to a boil.
Remove spice bag. Ladle beets and pickling liquid into hot sterilized pint jars, leaving 1/2 inch headspace.
Remove air bubbles with a narrow rubber spatula or plastic knife. Add additional pickling liquid, if required, to maintain headspace.
Wipe jar rims thoroughly with a clean damp cloth. Seal and process for 35 minutes in a boiling water bath.
For altitudes higher than 3000 ft (914 m), add 5 minutes to processing time.