Step 1

Lightly grease a 6-inch-by-2½-inch cake ring with the butter and place on a tray on a sheet of parchment paper.

Step 2

Break each of the biscuits into almond size pieces by hand and set aside.

Step 3

In a large bowl, combine the butter and sugar until the mixture starts to lighten.

Step 4

Melt the 4 ounces of the dark chocolate and add to the butter mixture, stirring constantly.

Step 5

Add the egg and beat to combine.

Step 6

Fold in the biscuit pieces until they are all coated with the chocolate mixture.

Step 7

Spoon the mixture into the prepared cake ring. Try to fill all of the gaps on the bottom of the ring because this will be the top when it is un-molded.

Step 8

Chill the cake in the refrigerator for at least 3 hours.

Step 9

Remove the cake from the refrigerator and let it stand.

Step 10

Meanwhile, melt the 8 ounces of dark chocolate in a double boiler or saucepan on the stove top over low heat. Slide the ring off the cake and turn it upside down onto a cake wire.

Step 11

Pour the melted chocolate over the cake and smooth the top and sides using a palette knife.

Step 12

Allow the chocolate to set at room temperature.

Step 13

Carefully run a knife around the bottom of the cake where the chocolate has stuck it to the cake wire and lift it onto a tea plate.

Step 14

Melt the remaining 1 ounce of chocolate and use to decorate the top of the cake.

Step 15

Courtesy of Chef Darren McGrady, The Royal Chef.