[header] How to make tart cherry juice [title] Put the clean, seedless cherries and sugar in a saucepan. [step] If you want your cherries on the super-tart side, add less sugar. You can also use a sugar substitute (like splenda), honey, or agave syrup. 
[substeps] To get the cherry pits out, score them along their sides with a knife. You may be able to pop the pits right out--or just take a butter knife and wedge them out if they're being difficult.