There are so many steam cake or egg sponge cake recipes available nowadays. I actually use my currently using wok to steam my cake, no need to sacrifice your wok
This is my favorite steam moist chocolate cake recipe & I have just made another one yesterday night, happy trying. Thanks to kitchencapers.net.

Steam moist chocolate cake [U]

1 1/2 bar of butter (250 gm + 125 gm)
2 cups of castor sugar
1 can of Evaporated Milk
4 Eggs,lightly beaten with a folk
2 cups of Plain flour
1 cup of Cocoa powder
1 tsp Baking powder
1 tsp Baking soda
1 tsp Vanilla Extract or 1 1/2 tsp Vanilla essence

*** this recipe can be halve easily

Combine castor sugar,Evaporated milk,vanilla extract or essence and butter in a saucepan.
Stir over low heat until sugar is dissolved and butter is melted,off fire and
keep warm.
Add the beaten eggs into the slightly cold Evaporated milk mixture and stir till well mix.
Sift the flour,cocoa powder,baking powder and baking soda into a large mixing bowl then pour the eggs mixture over the flour and stir till well mix (cake batter should be runny).
Heat up the steamer.
Lined and greased a 9 inch baking pan or 2 9'inch sandwich pan.
Pour the batter into prepared pan and place the pans into the steamer and cover the top of the pan losely with a piece of aluminuim foil.
Steam over medium heat for 1 1/2 hour (45 mins for 1/2 recipe/ingredients).
Cold the cake in pan before turning out for further decoration.

Chocolate topping

1 can of Condence milk
1 tsp of Vanilla extract or 1 1/2 tsp Vanilla essence
1/2 cup Corn oil
1/3 cup Cocoa powder,sifted
1/8 tsp Salt

1. Combine the sifted cocoa powder,condence milk and oil.

2. Stir over low heat till thicken (stirring all the time).

3. Add in salt and vanilla extract or essence.

4. Cold the chocolate topping a little before spreading on the cold cake.