Remove your egg white and keep it separately from the egg yolk
Add your vegetable oil into your egg yolk, Beat with your egg yolk and oil very well Add your plain flour
Beat well and set aside

Mix your egg white and egg yolk together and beat until it becomes smooth then pour it into the baking pan
Put it in the oven and make sure you check by placing your hand in the middle of the cake to know if it's done after 20minutes Your cake is now ready

Remove your pachment paper/baking paper.... Use a different pachment/ baking paper and roll your cake carefully
Put your cake in the fridge for 30 minutes before bringing it out.Note:the reason why you are meant to keep your cake in the fridge is to maintain the shape of the cake
Finally bring it out and cut it gently You can decorate your plate with caramel syrup,fruits just like I used pomegranate (ruman in hausa)

And here comes your Swiss roll.