Four chews is equivalent to 1 serving.
To yield ½ cup (125 ml) raspberry purée, you will need to blend 1 ⅓ cups (180 g) fresh raspberries in a small blender. Strain through a sieve to remove the seeds. Compost the seeds.
You can replace the raspberry purée here with another fruit purée of your choice (but avoid using fresh pineapple, papaya and kiwi, which will not set with the gelatin). This way, you can vary the flavours.