Steamed Vanilla Sponge

Steamed Vanilla Sponge  Butter                     100g Castor Sugar          100g Eggs                        2 Soft flour                 150g Baking powder        10g Milk                          Dash Vanilla essence       Few Drops Cream butter and sugar.  Add vanilla  Gradually add eggs.  Sieve and add baking powder and flour.  Add milk if required to obtain a dropping consistency. Place sponge mix into a suitable dish Cling film and steam for 1-1½ hours.