For the Icing:
Shift all-purpose flour.
Beat margarine and mix sugar and beat till smooth and fluffy. Mix all-purpose flour mixture and walnut powder and vanilla extract and beat the mixture. Knead the flour to roti-like, if necessary add milk. Divide it into 20-25 parts. Roll each part into long rings and make them round (like bangle). Greased and dust oven tray. Keep the rings in the tray, as such that they are 2 inches apart. Leave the contents for 1/2 hour. Bake them in the oven for 15-20 minutes at 375 degree F.
Dissolve icing sugar by mixing with a little water. Make paste. Apply the paste on the rings.