Mix flour, cocoa powder, baking powder and baking soda in a bowl through a strainer

Add sugar and salt and mix well

Add vegetable oil, egg, full cream milk and vanilla essence and mix it well with an electric mixer. Add the coffee and mix again

Prepare an aluminium baking pan with baking paper and pour the mix in the pan. Cover the pan properly with foil paper

Put the baking pan on steam for 50mins (place the pan over boiling water inside a big pot)

For frosting, mix all the ingredients except the butter amd strain the mixture into a bowl

Take a wok and put it on medium flame. Add the mixture here and add the butter

Stir it for 10mins

Slice the cake in the middle across the cross section and pour the frosting on both layers