Chocolate Yule Time Log

This is very easy for adults and fun for children to decorate!
I always loved making Chocolate Log, but I noticed a few Americans have never heard of it, therefore here is my contribution :)
Also, if you can't be bothered to make the Swiss roll...just buy one and decorate it ;)

Step 1 The Ingredients

For the Sponge:

3 eggs
90g Caster Sugar
90g self raising Floor
2tbsp Cocoa-Powder (or drinking chocolate powder)

For the Filling:

100g Plain/ Dark Chocolate (whichever you prefer)
a handful of Chestnuts (crushed)
80g Icing Sugar
3tbsp Milk (or until a spreadable texture)
Dash of Vanilla extract

For the Icing:

100g Plain/ Dark Chocolate (whichever you prefer)
100ml Double Cream
80g Icing Sugar (or until a thick consistence)