Method:
- Melt the butter, sugar and golden syrup together in a saucepan and cool a little.
- Beat the egg and vanilla extract together in a large bowl. Stir the butter mix into the egg then add the flour and sultanas and mix well. Turn into a 31x20.5x4.5cm deep/12x8x1½in deep swiss roll tin lined with baking parchment.
- Place in pre-heated oven gas mark 5/190ºC/170ºC fan/375ºF and bake for 18-20 mins – be sure not to overbake no matter what it looks like.
- While the cake is baking, make the icing and ice the cake while it is still hot.
- Gently melt the butter in a pan, stir in the other ingredients and mix well.
- Drizzle icing over cake immediately and leave to cool completely before removing from tin.
- Cut into squares to serve.
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