For Weng.....hope this will help you if you do not have optima flour.
120 gm. sugar
100 gm. cake flour
65 gm. melted buter or cornoil
1 tsp. vanilla essence
(1) Whisk eggs and sugar till light and fluffy.
(2) Fold in the cake flour, preferably use your palms (open up like a claw) and fold lightly taking care not to deflate the eggs.
(3) Pour in melted butter and vanilla essence and stir lightly.
(4) Pour into a 9" round cake tin and bake at 175C for about 40 mins or till a skewer comes out clean.
** for chocolate sponge cake, use 80 gm. cake flour + 20 gm. cocoa powder but increase your sugar to 130 gm.