Brush a cake plate with some oil. Place a cake ring or the rim of a springform pan (26 cm Ø) on top. Mix 1/8 l milk, pudding powder, espresso powder and sugar. Boil up the rest of the milk.
Pull the pot off the stove. Stir in pudding powder, bring to the boil again and simmer for at least 1 minute, stirring continuously. Pour into a bowl. Place the foil directly on the surface of the pudding so that no skin forms on it.
Let the pudding cool down.
Melt butter at low heat. Put the cookies in a freezer bag and close the bag. Finely crumble the cookies with a rolling pin. Mix the crumbs and liquid butter (depending on the type of cookie, a crumbly or rather doughy mass is formed).
Fill the crumb mixture into the cake ring and press it into the cake base. Chill for about 30 minutes.
Soak gelatine in cold water. Whip 400 g cream until stiff, while letting 2 sachets of vanillin sugar trickle in. Squeeze out the gelatine and dissolve at low heat. Stir in 2 tablespoons of cream by the spoonful.
Then stir into the remaining cream.
Stir the pudding briefly with the whisk of the hand mixer. Add the cream in 2 portions. Spread on the cookie base. Chill the cake overnight.
Whip 400 g cream until semi-stiff to stiff, while pouring in 2 sachets of vanilla sugar. Remove the cake from the cake ring. Spread the cream on top like a wave. Dust with cocoa shortly before serving.