Wash and trim your beets and place them in a large pot. Cover the beets with cold water and bring them to a boil over medium-high heat.
Once it starts boiling, reduce the heat and let it simmer for around 30 minutes or until tender when pierced with a fork.
Once they're done, immediately plunge them into a large bowl filled with cold water and let them chill for at least 30 minutes, or up to an hour. Change the water regularly to keep them cold.
Peel off the skins and set the beets aside.
Prepare your canner, jars, and lids.
Put cinnamon sticks, cloves, and allspice into the center of a square of triple-layered cheesecloth and tie it into a spice bag.
In a clean large pot, combine brown sugar, salt, water, vinegar, and your spice bag. Bring it to a boil over medium heat, stirring often until the salt and sugar are dissolved.
Reduce the heat to a simmer and add your beets into the pot with the vinegar mixture. Let it simmer for around 10 minutes until the beets are heated through.
Fill your jars with the beets and vinegar mixture, making sure to leave a 1/2 inch of headspace. Wipe the rims of the jars and put on the lids.
Place your jars into the canner and make sure they're covered by at least one or two inches of water.
Bring it to a boil and process the jars in a water bath canner for 30 minutes below 1,000 feet in elevation (Altitude adjustments below).
Remove the jars from the canner and let them cool completely.
Check your seals, label, and store.