Put the shortbread biscuits in a freezer bag and seal it. Finely crumble the pastry with a dough roll. Soak gelatine in cold water. Whisk egg yolks and sugar with the whisk of the hand mixer until thick and creamy.
Stir in lemon peel and lemon juice. Squeeze out the gelatine and dissolve carefully in a small pot at low heat. Remove from the stove.
Stir about 10 tbsp. of the lemon cream into the gelatine by the spoonful. Then stir and let it run into the rest of the cream. Beat egg white and salt until stiff. Whip the cream until stiff and allow the vanillin sugar to trickle in.
When the cream begins to gel, fold in portions of cream first, then beaten egg white.
Layer the breadcrumbs and cream in a glass bowl. Chill for about 2 hours. Let raspberries thaw at room temperature for about 15 minutes. Stir jam until smooth. Mix in the raspberries. Pour onto the cream and decorate with lemon balm.