For the lemon cream, mix pudding powder and 150 g sugar. Stir with lemon juice until smooth. Bring milk and 2⁄3 lemon zest to the boil. Stir in the pudding powder, bring to the boil and simmer for about 1 minute. Remove from the stove. Stir in yoghurt and let it cool down. Stir several times.
For the compote, peel, quarter, core and cut apples into pieces. Put them in a pot with 50 g sugar, remaining lemon peel and apple juice. Bring to the boil, cover and stew for about 8 minutes. Stir starch and 3 tbsp. cold water until smooth. Stir into the compote and simmer for about 1 minute. Let it cool down.
Whip the cream until stiff and fold into the lemon cream. Crumble the biscuits coarsely and layer them with the lemon cream and compote in a large bowl. Keep cool until serving.
Pad a folding box with dish towels. Put a dessert bowl inside, keep it fresh with cold packs.