Peel the orange so that the white skin is completely removed. Remove the fillets with a sharp knife between the parting skins. Put the yoghurt in a bowl and press the juice from the parting skins into the yoghurt.
Add sugar and stir until smooth. Add raspberries and orange fillets to the yoghurt and fold in carefully. Layer the yoghurt with the cornflakes alternately in the glass. Decorate the yoghurt with a raspberry and an orange filet.
Put on lemon balm.