1. In a bottle add egg, sugar, oil, lemon and green cardamom and mix throughly.
2. In a seprate bowl, sift plain flour, custard powder and baking powder, and mix together.
3. Mix both the mixtures together.
4. Grease the cake pan with a little oil.
5. Pour the mixture in the cake pan, and bake for 7 minutes.
6. Cake is ready.