Pistachio meringues with mango & mandarin ice cream

These meringues, with fresh, subtle Indian flavours, can be made in advance and frozen for up to a month – ideal for a New Year buffet

You can make the ice cream up to a month ahead. First, cut the skin from the mango with a sharp knife, cut the flesh from the stone and chop very finely. Whisk the cream, Cointreau, icing sugar, mandarin zest and juice together until it holds its shape. Fold in the mango. Tip the mixture into a rigid container and freeze for 3 hours until softly frozen, stirring once after 1½ hours.
Meanwhile make the meringues. Preheat the oven to 120C/gas ½/fan 100C. Line 2 large baking sheets with baking parchment and draw 16 x 6cm circles, spaced well apart, on the sheets. (Use a jar lid measuring 6 cm across as a template.)
Whisk the egg whites with a pinch of salt until stiff. Add half the caster sugar and whisk until glossy. Add the remaining sugar a tablespoon at a time while whisking. Fold in the nuts with a large metal spoon.
Spoon the meringue on to the paper circles and spread to make even rounds. Bake for 1 hour, switching the trays round after 30 minutes. The meringues are ready when firm and sound hollow if tapped. Cool on the trays then peel off the paper.
When the meringues are cool and the ice cream is softly frozen, sandwich the meringues together in pairs using the ice cream. Put them into a container in a single layer and freeze, along with the leftover ice cream.
To serve, remove from the freezer and scatter with the extra chopped nuts. Serve on plates and eat with forks.