Passion Fruit Icing

Melt the butter gently in a heatproof bowl over simmering water or in a microwave.

Chop the passion fruits in half and scoop out the flesh, passing it through a sieve to leave the juice.

Add the passion fruit juice and lemon juice to the melted butter and whisk together.

Gradually add the icing sugar and stir continuously until you reach the desired consistency to pour over your cake.