Seville orange curd

In a medium pan, stir the orange zest and juice and the sugar. Bring to the boil, then reduce the heat and simmer for 5 minutes.

Add the butter, stirring until melted and combined. Remove from the heat and leave to cool.

Whisk the eggs and egg yolks together in a large bowl, then pour the cooled juice and sugar mixture over the eggs and whisk in well. Return to the saucepan and cook very gently over a low heat, stirring continuously, for 10 minutes until thick enough to coat the back of a wooden spoon.

Pour the curd into sterilised jars (pouring the curd into a jug first makes filling the jars easier). Put the lids on the jars and leave to cool completely before placing in the fridge to chill and fully set. Label and keep in the fridge for up to 1 month.