Defrost the raspberries. Halve melon again and remove seeds. Remove the flesh from the skin and cut into pieces. Wash lemon hot, dab dry, grate the peel, squeeze juice.
Season yoghurt with honey, lemon peel and juice. Whip cream until stiff and fold in. Mix the muesli with the fruits and fill into 4 bowls. Add yoghurt cream and garnish with lemon balm.