Wash cherries and take each one and slash with tip of paring knife
Take one cup of the rum and add the sugar into the half-gallon jar, shaking well to dissolve the sugar as much as you can.
Add cherries and shake again to mix as best you can
Add remaining 3 cups of rum
Shake again gently to distribute the cherries
Place the jar in a sunny spot, indoors and let sit for 7 days.
After the 7 days, put the jar in a dark spot, and let it sit undisturbed for another 40 days
After the time is up, put a strainer over the top of a pitcher or container and strain the cherry mixture through it.
Cover the strained juice and let settle for a couple of hours, then gently pour into a clean 1 qt jar, so that you do not include any of the sediment.