Put frozen cherries in a pot and let them defrost. You can heat it at a low temperature to defrost faster.
Leave the liquid formed during defrostin in the pot, as this will make the filling more juicy.
Add coconut sugar to the cherries, stir and bring to a boil.
Meanwhile, mix the starch with water.
When the cherries are boiling, stirring constantly, stir in the corn starch mixture, reduce to a medium temperature and cook for 3 minutes, stirring several times in between.