Buy cherries that are firm without blemishes and fresh enough so their stems are still green. Wash cherries, spread them out on a towel to dry. Remove stems and pack into the jar. Cover with whiskey, gently packing cherries to remove any trapped air. Completely cover cherries. Seal and refrigerate 4 weeks before serving.
Note: If you prefer to use Vodka, add a 1/2 cup of sugar, 3-4 whole cloves and piece of cinnamon stick. Do NOT stir.