I've had this recipe for years and used to make them when the children were young as a treat. I only found out recently that it is a Canadian sweet when I saw a similar recipe on a blog.
The base is chocolate, digestive biscuits, coconut and walnuts. The filling is custardy and the topping chocolate. I think the other recipe was simpler than mine. I can actually eat everything in this but I made it because my DIL is Canadian and thought she would like it. Am looking forward to trying it.