In a quart jar, combine pitted cherries and granulated sugar. Top with whiskey, leaving about 1 inch of headspace. Cover the jar tightly with a lid and shake well.
Place the jar in a cool, dark place for a minimum of 3 months, allowing it to mature for up to 1 year. Shake the jar occasionally during this period to help dissolve the sugar and enhance flavor development.
To serve, strain cherries out. Then, pour over ice or in your favorite cocktail.
