Beat the yolk and sugar until the colour lightly. Add oil and beat well. Add orange juice and mix them well

Add plain flour and cornflour into it. Add zest of orange and mix them well

Beat the white egg with a pinch of salt and 1/4 lemon juice at medium. Add sugar slowly and beat until it’s thicker

Add 1/3 the white egg mixed into the flour mixed and use the spatula to mix them well. Repeat it until finish. Have to fold the right technique

Pour the mixed from the height 10-15 cm into a pan to break the bubble. Shake the pan lightly to make it flat

Preheat the oven at 160 degree and bake in 40-45 mins.

Put it upside down in a rack from 1-2 hours until it’s cool properly.