Iced Orange Parfait

For the parfait:
3 oranges
10 lemon
3 egg yolks
100g / 3 1/2 oz caster sugar
1 tbsp orange-flavoured liqueur
200ml / 7 fl oz double cream
100g / 3 1/2 oz mascarpone cheese

For the citrus sauce:
7 oranges
25g / 1 oz caster sugar
juice of 10 lemon
2 tsp cornflour
splash of orange-flavoured liqueur

To decorate:
75g / 3 oz  plain chocolate cocoa powder, for dusting

Make the parfait: scrub one orange and, without peeling, cut it into chunks. Whiz in a food processor or blender until finely chopped. Press through a sieve. Squeeze in the juice from the remaining oranges and the lemon.

In a bowl, whisk egg yolks and sugar until pale and thick. Stir in the fruit juices and transfer to a pan. Cook the custard over low heat, stirring until thick enough to coat the back of a spoon. (Don't let boil or it will curdle.) Let cool.

When the custard has cooled, add the orange liqueur. Transfer to an ice cream machine and churn until semi-frozen. Stir the cream into the mascarpone, then add to the machine and churn until frozen. Spoon into 6 x 100ml / 3 1/2 fl oz moulds or ramekin dishes. Freeze for at least 2 hours.

Make the sauce: pare the rind from 2 oranges and cut into matchstick strips; squeeze their juice into a small pan and add the rind. Add the sugar and lemon juice. Simmer gently for 5 minutes, until the sugar has dissolved and the rind is tender. In a cup, blend the cornflour with 1 tablespoon of water, then mix in a little hot juice. Add to the pan and cook, stirring, for 1 minute until the sauce has thickened slightly. Add a splash of liqueur and allow to cool.

Peel remaining oranges, removing pith, then cut into segments (over a bowl to catch juice). Add juice and segments to the sauce, cover with film and chill.

Make the decorations: line a tray with greaseproof paper. Melt the chocolate in a heatproof bowl set over a pan of simmering water, or in the microwave cooker. Spoon into a small greaseproof paper piping bag, then pipe shapes on the prepared tray. Leave to set. When hard, peel away the paper.

Remove parfaits from freezer and dip each mould briefly in hot water. Run a knife around rim, then turn out on a freezer-proof tray. Return to the freezer. About 30 minutes before serving, transfer the parfaits to the fridge to soften. Place one on each serving plate and surround with the sauce. Decorate with chocolate shapes and dust the plates with cocoa and serve the Iced Orange Parfait.