Place berries, sugar & lime juice in a small sauce pan & cook over medium heat until the sugar melts and berries are soft, about 5 minutes.
Process in a blender o food processor and then pass over a very fine.mesh strainer. add 1/4 cup water to the seeds and strain more to get all the juices. Retur all the juice to the pan and bring to boil once more.
Divide into 2 glasses, add ice and, club soda to taste, garnish with lime slices & serve.