Blueberry Jam Swirl Cake

This cake is a vanilla sponge marbled with blueberry jam.

Last time I tried to swirl or marble jam through a cake it really didn't work well as I ended up just drizzling it on top and it burned a little. However this time I spread two layers in between sponge mix and it made an even more attractive pattern inside than I expected. I don't think you can beat a simple victoria sponge style cake with a kick of vanilla and sweet blueberry jam.