Beat in the orange zest and then gradually beat in the icing sugar or muscovado sugar until well combined, light and fluffy.
Finally gradually beat in the brandy to taste, adding a tablespoon at a time, taking care not to let the mixture curdle.
Store in a sealed container in the refrigerator for up to 2 weeks. Bring to room temperature to serve. Freeze for up to 2 months thaw overnight at cool room temperature.Nutrition information is calculated usingan online nutrition database - is approximate and is meant as a guideline only.