Take brown sugar and
butter in a large bowl and cream together with an electric beater. Add the eggs, vanilla essence, hung yogurt and milk and beat well. Add refined flour, baking powder and half the walnuts and fold in well.
Pour the batter into
the greased baking tin, keep it in the preheated oven and bake for 20-25 minutes.
Heat sugar in a
non-stick pan, add sugar and the remaining walnuts and keep stirring till it caramelizes. Transfer this mixture onto the chopping board and let it cool. Then break into pieces.
Bring the baking tin
out of the oven and let it cool a little.
Demould onto a
serving platter, cut into squares, sprinkle the caramelized walnuts over the pieces and serve.