We value your privacy
For the buttercream, melt the chocolate, set aside and leave to cool slightly (about 10 minutes). In a large bowl, beat the butter until creamy and light using an electric hand mixer, then add 50g of the butternut purée. This won’t immediately combine so just ensure it is mixed in as well as possible. Gradually add the icing sugar until fully incorporated. Add the melted chocolate and beat until light and fluffy. Add sea salt to taste.