Finely crush and sift Marie biscuits. Place crumbs in a bowl and mix in sifted icing sugar. Grate chocolate and mix together with butter and melt over a slow fire. Pour melted
Put the karhai on the fire.Let it heat up.
Sieve the semolina and drop it into the karhai.Without oil,roast it lightly,stirring all the time till it turns light brownish.Po
Heat a cooking pot then put-in the butter and let it melt.Add the condensed milk then stir well.Put-in the purple yam then continue stirring.
Add the vanilla extract and stir