Chocolate Souffle

The cake itself is simple: a delicate one-layer sponge with a pretty intense coffee flavor. But the real kick in this version of the cake comes with the syrup that later saturates the cake -- more coffee, naturally with whiskey in it -- and then with the topping, rich with double cream as a good Irish Coffee topping should be, flavored with yet more whiskey, and finished off with an inspired sprinkling of that best-loved of Irish native nuts, the hazelnut.
Ingredients:
For the cake:* 2/3 cup / 120g / 4 ounces butter * 3/4 cup / 120g / 4 ounces granulated sugar / caster sugar * 3/4 cup / 120g...