Wash, clean and stone the cherries. Steam cherries in pineapple juice until 200 g. Line a sieve with a gauze cloth. Pour in the cherries and juice, collect the juice. Measure out 1/2 litre of juice.
Mix carefully with Batida de Coco, rum, grated coconut, lemon juice and jam sugar in a large pot. Wash the mint and remove the leaves. Stir in mint and pitted cherries. Bring to the boil while stirring, then boil for 4 minutes until bubbly.
Skim off any foam that has developed. Pour it still hot into carefully cleaned glasses and close them well.