Instructions: Preheat the oven to 180c/350f/Gas 5.

1 Preheat the oven to 180C/350F/Gas 5. Sift the polenta, flour, baking powder and salt into a bowl. Place the yoghurt, oil, lemon rind and juice into a jug and stir until combined.

2 In a separate bowl, place the eggs and egg whites with half of the sugar and beat for a few minutes until creamy. Beat in the yoghurt mixture until smooth and then fold in the dry ingredients until just combined - do not over-mix.

3 Pour the batter mixture into a 1.2 litre/2 pint lightly-oiled loaf tin, lined with parchment paper. Bake for 40-45 minutes or until a toothpick inserted in the centre comes out clean.

4 Meanwhile, place the remaining sugar in a pan with 200ml/7fl oz of water and the rosemary branches. Bring to the boil, then reduce the heat and simmer for 10 minutes. Leave to cool completely, then strain through a sieve.

5 When the cake is cooked, place on a wire rack to cool for 15 minutes, then invert and peel off the parchment paper.

6 Prick all over with a toothpick and drizzle over half of the rosemary syrup so that it completely soaks into the cake, leave to cool completely.

Keep the remaining rosemary syrup in the fridge until ready to use.

7 To serve: Cut the cake into slices and arrange on plates. Scatter around the raspberries and drizzle around some more of the syrup. Add dollops of yoghurt and decorate with rosemary sprigs.

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