Black sesame sponge
Separate the egg whites and the yolks.
Mix the oil and milk, emulsify throughly, then add the egg yolks.
Slowly add the black sesame paste and sifted flour, and mix well.
Whisk egg whites and sugar until meringue, fold into egg batter and beat well.
Pour into a 30-by-30 baking dish 180°C for 15 minutes.