I said that I wanted to bake my way through this chocolate cookbook, and I totally mean it. The cake recipe used for both the gateau forestiere and the jungle cake was from that book, as is the following recipe. It's wonderful.
I prepared this mixture in advance, but we ended up having a super hot weekend and so on the night I constructed this for dessert, the vanilla layer began melting all over the place. So there went my grand plans of having a perfectly chequered parfait. But what it's lacking on the aesthetic side it certainly made up for it in taste.
This recipe gives you the freedom to choose your favourite berry. I used strawberry for both the parfait and the sauce. I also sieved out the seeds for a nicer texture. Alternatively, you could prepare two berry layers (such as raspberry and blackberry) if you want a multi coloured/flavoured parfait.