Chocolate and orange tea loaf

1.Preheat oven to l80°C or 160°C fan. Grease and line a l9cm x 9cm loaf pan.

2.Melt 50g of chocolate in a heatproof bowl over a pan of simmering water, stirring often, until melted and smooth. Remove from heat.

3.Using an electric mixer, beat butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Stir in flour.

4.Stir one-third of batter into chocolate. Stir rind into remaining batter. Drop alternate spoonfuls of orange and chocolate mixtures in pan. Gently swirl with a knife for marbled effect. Bake for 30 minutes, until a skewer inserted comes out clean. Turn onto a wire rack to cool.

5.Place remaining chocolate in a heatproof bowl over a pan of simmering water, stirring until melted and smooth. Spread chocolate over cake. Allow to set before slicing.