Marble Butter Pound Cake

Ingredients:

(A)
225 gm butter

(B)
160 gm castor sugar
5  eggs yolks
2 teasp vanilla essence

(C)
5 egg whites - whisk till stiff

(D) Sifted:
225 gm flour
1/4 teasp salt
1 1/2 teasp baking powder

2 tabsp. milk
1 1/2 tabsp cocoa powder

Method:

• Preheat oven at 180°C  Line an 8-inch round cake tin or 10"x5" loaf tin with parchment.
• Cream (A) till light and fluffy. 
• In a separate bowl, whisk the (B) till light. 
• Add this into the butter and beat on medium speed till just incorporated. 
• Fold in (C) into the egg yolk mixture in 3-4 batches. 
• Fold in (D) and milk.  Divide the batter into two, 3/4 in one batch and the 1/4 in another bowl. 
• Sieve cocoa powder over the 1/4 batch and  mix well. 
• Pour plain batter into tin, spoon dollops of chocolate batter over the plain. Continue to fill up the tin and end with dollops of chocolate on top. Use a skewer to make marble effect.
• Bake for 40 minutes or until a tester inserted comes out clean.