In a bowl, combine the Greek yoghurt, honey, cornflour and eggs. Mix until smooth. Toss the raspberries with the extra teaspoon of cornflour, then gently fold them into the batter.
Line a 15cm / 6-inch round baking tin with baking paper. Pour in the batter and give it a gentle tap to distribute evenly. Cover the top with foil.
Bake at 180°C (160°C fan / 350°F) for 50 minutes. Remove the foil after the first 20 minutes.
Remove from the oven and leave to cool in the tin for 20 minutes. It will be soft and fragile — handle gently when transferring to a plate. Keep the baking paper on.
Refrigerate for at least 2 hours. Once set, peel off the baking paper, add your favourite toppings and serve.
Notes
Notes Don't skip the fridge time — the cake needs it to firm up and become sliceable. For toppings, try fresh raspberries, a drizzle of honey, or a dusting of freeze-dried raspberry powder. Keeps in the fridge for up to 3 days.