Fresh Orange Sauce

• 1½ tsp arrowroot or cornflour
• 1 tbsp caster sugar
• finely grated zest of

Put the arrowroot, sugar and orange zest in a heatproof bowl and stir together. Add 2 tablespoons of the orange juice and stir until smooth.

Put the remaining orange juice in a saucepan and bring to the boil over a high heat, then beat it into the arrowroot mixture until smooth.

Retu