Grind both the varieties of unibic cookies separately and take them out in separate bowls.
Line / grease a baking tin.
Preheat the cooker with a stand inside on medium flame.
Add coffee powder, cocoa powder, half of baking soda and half of baking powder to the choco ripple cookie powder.
Similarly add rest half of the baking powder and baking soda to the oatmeal digestive cookie powder.
Take sugar and butter in a big bowl and blend thoroughly add cream/malai, vanilla essence and milk and beat well to get fluffy mixture.
Now add half quantity of it to the choco ripple mixture and the rest half to the digestive cookies powder mixture
Mix very well, slowly, till both the batters are uniform and fluffy.
Now pour a ladle full of light coloured digestive cookie batter in the greased tin.
Next pour the dark coloured choco ripple batter in the centre
Repeat the steps until all the batter is poured.
Lightly pat the cake tin from the sides.
Make an abstract design with the help of a toothpick or a fork.
Now put the tin in pre-heated cooker and cover with lid, without the whistle
Set the flame high for 10 minutes ,then on medium for another 10 mins, then lower the flame for 20 minutes
Check with a long knife in the center, if it comes out clean , then cake is ready, switch off the flame.
Let it cool on a wire rack for say 30 mins, cut in triangles and serve to your loved ones with coffee or tea.
