To Make The Cookies:

• Heat the oven to 180°C (350°F ).
• Cream the butter and sugar together until it is white and fluffy.
• Sift the cocoa powder and flour together, then mix in to the creamed mixture.
• Crush the cornflakes slightly then carefully stir them into the mixture.
• Put tablespoonfuls of the cookie dough onto a cookie tray covered with baking paper.
• Bake for 18 - 20 minutes.
• Leave on the tray to cool for 10 minutes, then transfer to a cooling-rack.

To Glaze The Cookies:

Once the afghan cookies have cooled completely:

• Put the butter and cocoa into a small heatproof bowl.
• Add the boiling water and whisk until the butter has melted.
• Add the icing sugar and stir until you have a homogeneous mixture.
• Add dollops of icing on the tops of the cookies (about 1 Tbsp for each cookie).
• Place half a walnut on each cookie.
• Leave the cookie to set before storing in an airtight container.