Cooks have been making these pickles for centuries.The first cookbook published in the United States, in 1796, includes a recipe for preserving watermelon rind.
Add vinegar, water, sugar and spice bag to a large pan and simmer for 10 minutes.
Then, add the rind and
simmer for about 40 minutes to 1 hour, until about half the rinds are clear or translucent.
Remove spice bag and pack hot pickles into sterilized jars, leaving ½-inch head space and removing any bubbles.
Wipe rims of jars, then then add lids and rings, adjusting to fingertip tight.
Transfer the jars to a rack in a water bath canner. Process covered for 10 minutes.
Remove jars from the canner and allow to cool on kitchen towels for 24 hours before moving.