If you are using frozen cherries, let them thaw completely. If you are using fresh cherries, remove the stems and pit them.
Add bourbon, sugar and vanilla to a saucepan over low heat. Stir until the sugar has dissolved, about 5 minutes.
Let bourbon mixture cool for 20 minutes.
Divide cherries into 6 4oz. jelly mason jars.
Once bourbon mixture has cooled, pour it over the cherries, filling to the first rim.
Seal cherry jars with lids and rings.
Refrigerate 1 week, then add to your favorite cocktails.
Notes
Nutritional data is calculated per 4 oz. jar. Each jar holds approximately 12 cherries. 3 cherries per cocktail would equate to approximately 47 calories and 6g of sugar. If using frozen cherries: place frozen cherries in a colander and let thaw for 20 minutes. (Cherries can thaw while bourbon mixture is cooling)If using fresh cherries: remove stems and pit cherries.