Altered ingredient amounts.
My family & I agree that they are delicious. As another reviewer mentioned the instructions do say to foil & grease the tin, which I did and I had no problems with sticking. Will definitely make these again Edit: I made these again and cut the sugar down, while upping the vanilla to 2 tsp and they were much better. - 21 Jul 2008
I took Cindybeth's advice - I upped the vanilla and cut the sugar down. I used 1 cup of brown sugar. I also changed the choc to 200g dark choc and took the butter down to 130g. Rather than add walnuts (not a fan of them) I added ground hazelnuts. It's a HUGE hit in my house! Great recipe, thanks! - 16 Aug 2010