Put the millet in 600 ml boiling water, cover and let it swell at low heat for about 40 minutes. Then let it cool down. Wash and clean the berries. Cut strawberries into quarters or halves, depending on size.
Wash lemon balm and, except for a few leaves for garnishing, chop coarsely. Mix yoghurt, lemon juice and chopped lemon balm together, mix with the cooled millet and season to taste with vanilla sugar and sugar.
Arrange millet yoghurt with the berries and serve decorated with balm leaves.