Sugar-free victoria sponge

Method

• step 1

  Heat the oven to 180C/160C fan/gas 4. Butter two round 18cm cake tins and line with baking parchment. Beat the butter and xylitol together in a large bowl using an electric whisk until light and creamy. Add the egg, a little at a time, beating well after each addition. Fold in the flour and a pinch of salt. Divide the batter evenly between the two tins and smooth the surfaces using a spatula. Bake for 15-20 mins until golden and a skewer inserted into the middles comes out clean. Leave to cool completely in the tins, set on a wire rack.

• step 2

  If using defrosted raspberries, first tip them into a sieve over the sink and use the back of a spoon to extract as much liquid as possible (frozen berries contain a lot of water, and you don't want the filling to be too wet). Put the raspberries in a small bowl and mash with the xylitol. Set aside.

• step 3

  Lightly whip the double cream, if using, until just holding its shape. Remove the parchment from one of the sponges and put on a cake stand. Spoon over the crushed raspberries in an even layer. Sandwich with the second cake, then spread over the whipped cream in thick swirls. Chill until ready to serve.