After picking the berries, put them, including the seeds, in a blender or food processor and blend/process into a pulp. (Traditionally, the berries were pounded, including the seeds, to a pulp with a formed rock).
Form the pulp into patties, cover them with cheesecloth and lay them out to dry, turning occasionally. (Traditionally, they were dried in the sun).
This process takes about two days. The patties may be stored in a tightly covered container for future use and can be used to make berry sauce.