Put the baking tin into the freezer for 30 minutes. Pull out and pour the batter evenly. Bake about 7 minutes for 180 degrees. Pull out of the oven and put the sponge cake on the desktop. Remove the baking paper evenly. Roll it up into warm towel. Then remove towel and halve the sponge cake. Grease it with jam and cream filling. Roll it up and put on salver.