Spoon the yoghurt into a sieve lined with muslin or a new chux. Place over a bowl. Cover and refrigerate for 2 hours or overnight if time permits. Discard the liquid in the bowl. Spoon the thick yoghurt into a clean bowl and swirl through the cinnamon.
Preheat the oven to 180°C fan forced. Scatter the pistachio and sesame seeds over a baking tray and cook for 6-8 minutes or until toasted. Cool, roughly chop the pistachio.
Spoon the cinnamon yoghurt onto serving plates. Scatter over the blueberries, blackberries and watermelon. Sprinkle with pistachio and sesame seeds.
Drizzle with honey and serve with toasted brioche or fruit bread for breakfast.