Heat the oven to 120C/fan 100C/gas ½. For the meringues, slowly whisk the egg whites, with an electric whisk, until frothy and doubled in size. Add the sugar, one spoon at a time, until it’s all been added, then add a pinch of salt, whisking continuously. Increase the speed and whisk again until stiff peaks form. Spoon 4 individual portions onto a baking tray lined with baking paper. Bake for 1½-2 hours, until they’re crisp and come away from the baking paper cleanly. Leave to cool completely in the oven while it’s turned off, to prevent any cracks.
Make the coulis by adding 200g raspberries and the sugar to a small pan, and simmer for 15 minutes until the fruit
has broken down and it turns syrupy. Push through a sieve, cool to room temperature, and chill.