Sieve the flour, baking powder, baking soda and salt together and keep aside
Whisk sugar and curd well till sugar dissolves
Add oil and vanilla essence and mix well
Fold the dry ingredients in wet ones till no lumps
Pour it in a greased baking dish
Bake in preheated oven at 180 degree Celsius for 25-30 mins
To make plum sauce add chopped plum,sugar and lemon juice in a pan
Stir it on low flame.
Mix cornflour in little water.
After 4-5 mins of stirring add the cornflour to the pan.
Stir till it gets little thick ,then switch off the gas
Whip the heavy cream and sugar together
Let the cake cool after it is done,for 10 mins
With the back of wooden spoon make half inch holes in the cake
Spread the plum sauce on the cake and let some go in the holes too
After the cake is completely cool,spread the whipping cream on the cake
Spread the leftover sauce on the cream and spread it with spoon
Let the cake cool for 3-4 hours and then serve