Wash and pit the cherries. Either pit vertically to remove the stem or pit horizontally to keep the stem intact.
In a saucepan over medium high heat, combine the cherry liqueur, sugar and tart cherry juice. Stirring to dissolve the sugar. When it just begins to simmer, remove from the heat.
Add the cherries and let cool to room temperature before storing the cherries and the juice in a lidded jar in the refrigerator.
Notes
Sugar is optional, but makes a sweeter cherry. Tart cherry juice is optional, but it adds even more cherry flavor. These should keep in the refrigerator for several months.