All purpose flour – 11/4 cups
Cocoa powder – 4 tbsp
Powdered sugar – 11/4 cups
Baking powder – 1 tsp
Baking soda – 1/2 tsp
Milk – 11/4 cups
Vinegar – 2 tbsp
Egg – 1, large
Melted Butter – 2 tbsps., cooled
Vanilla essence – 1 tsp
Salt – a pinch
Add vinegar to milk & mix. Keep it aside for 15 minutes. This is sour milk.
Sift together the flour, baking powder, soda, salt & cocoa powder.
Beat together the egg & powdered sugar with an electric mixer. Stir in the vanilla essence.
Add the melted butter & mix. Add the sifted flour mixture & the sour milk alternately till you get a smooth cake batter.
Pour this batter into a greased cake tin & cover it tightly with an Aluminium foil ( the steam should not escape from the cake). Cook the cake in a steamer for 45 minutes on high heat.
Let the cake cool completely before cutting it into desired shapes.
Source: Lakshmi Nair