Begin with the ice cream, as this can be made well in advance. Bring the milk to the boil, then add the mint leaves and blanch for 20 seconds. Strain the mint leaves (reserving the milk), then refresh in iced water. Drain thoroughly, wringing the leaves out to remove as much liquid as possible, then set aside

Pour the infused milk into a clean pan along with the cream and bring to 40°C, stirring regularly. Add the rest of the ingredients, then continue to heat and stir until the mixture reaches 80°C. Once you hit this temperature, strain the mixture through a fine sieve into a container, cover with cling film and allow to cool completely

Once cool, add the drained blanched mint leaves and use a hand blender to blitz the mixture until fully incorporated. Transfer to an ice cream maker and churn according to the manufacturer’s instructions, then reserve in the freezer until needed

For the mousse, soak the gelatine leaves in cold water for 5-10 minutes to soften. Meanwhile, whisk the egg yolks and sugar together in a bowl until pale and frothy, and bring 300ml of the cream and the milk to the boil

Pour a little of the hot cream over the egg yolks, whisking to temper, then gradually add the egg yolk mixture back into the pan of cream, whisking thoroughly. Continue to cook over a low heat until the mixture thickens slightly, then remove from the heat

Add the chopped chocolate and cocoa to the mousse base, whisking until melted, then add the gelatine and continue whisking until dissolved. Place the pan in a bowl of iced water to cool quickly

While the mixture cools, semi-whip the remaining 160ml of double cream

When the chocolate mixture is at room temperature, fold in the semi-whipped cream until fully incorporated. Transfer to a piping bag and keep in the fridge to chill for at least 2 hours before serving

To make the pastry rounds, preheat and oven to 180°C/gas mark 4. Roll the puff pastry out until approximately 5mm thick, then use a 5cm cutter to stamp out discs of dough – you want around 24-32 discs in total, so you may need to re-roll out the trimmings. Line a baking sheet (or several, depending on size) with baking paper, then arrange the discs on it in a single layer. Bake for 14 minutes or until puffed up and golden, then leave to cool. If making these in advance, store them in an airtight container until needed

To serve, pipe a base of mousse on each serving plate. Top with a pastry disc, then continue creating a tower of alternating layers of mousse and pastry. Finish with a pastry disc, then dust with icing sugar. Delicately balance a scoop of the mint ice cream on top to finish