This recipe is based on a raspberry twist recipe I saw on ‘Nigella Bites’. I couldn’t remember her exact measurements, but I copied her idea. The berries can be substituted with any types of berries (fresh or frozen (and thawed)), or any type of fruit that can be mashed (like mangos, canned peaches or kiwifruit). The chocolate cookies can be substituted with plain ones, or even oatmeal. You can also play with the yoghurt, using different flavours or just plain natural (or even Fruche). Prep time doesn't include (optional) overnight chill time.