Soak gelatine in plenty of cold water. Stir soured milk and lemon juice and sugar until smooth. Squeeze the gelatine and dissolve. Stir the gelatine into the soured milk. Whip cream and vanilla sugar until very stiff.
As soon as the soured milk begins to set, fold in the cream. Wash, clean and halve the strawberries. Peel the lemon peel with a julienne nipper. Fill strawberries into dessert bowls. Pour the soured milk cream over them.
Serve garnished with lemon julienne and lemon balm.