Okay so I have this friend who regularily posts food porn to her facebook account. I saw this little delicious tidbit, that I found just o so unresistable.  So I'm posting the link and recipe (just in case the blog ever goes down). I need somewhere to store the recipe too.
http://www.citrusandcandy.com/2010/09/triple-layered-vanilla-chocolate-and.html
For the Peanut Butter and Chocolate Parfait
Mousse Base
5 egg yolks
100ml water
150g caster sugar
150g dark chocolate (around 60% cocoa content), chopped
100g smooth peanut butter
300ml double cream or thickened cream
For the Vanilla Parfait
3 egg yolks
50ml water
75g caster sugar
1 tsp vanilla extract
1 tsp vanilla bean paste (see note)
150ml double cream or thickened cream
Note  - Because there's no need to heat cream and therefore no opportunity to  steep a vanilla bean, I chose to use extract and paste instead.
Method
Place  water in a saucepan and pour the sugar in the middle of the water. Over  low heat, stir until sugar has dissolved. Increase the heat and bring  to a boil and cook for 7-10 minutes until slightly syrupy or 110°C on a  sugar thermometer.
Meanwhile, when the sugar and water has  boiled, start whipping your egg yolks so it pales and thickens. As soon  as the sugar syrup reaches the temperature, take it off the heat, and  while continuously whisking, slowly trickle the hot syrup on the side of  the bowl so that it runs down slowly into the egg yolks as it is  whisking. Be careful not to let any sugar syrup hit the beaters/whisk as  it's whisking otherwise you'll be hit by molten projectiles of sugar.
When  you've finished pouring, continue whisking for at least 5 minutes until  the bowl is no longer hot and the egg mix is thickened and aerated. Set  aside.
In two separate heatproof bowls over pots of gently  simmer watering, melt the chocolate and peanut butter separately until  melted and smooth. Take off the bain marie and set aside to cool for 5  minutes.
Divide the mousse base between the melted peanut butter  and chocolate. Fold each one until combined and place in the fridge to  cool.
Whip up the double cream until soft peaks. Divide the cream  amongst the two cooled mousse bases and fold until combined. Line a  large loaf tin with glad wrap and pour in the peanut butter parfait,  level and freeze for at least a couple of hours. Place the chocolate  parfait in the fridge in the meantime.
After it has mostly frozen, layer on the chocolate layer on top of the peanut butter, level and freeze again.
While  the PB and chocolate parfaits are freezing, make the vanilla parfait in  exactly the same method (adding the vanilla extract and paste to the  egg yolks and whisking altogether before adding the sugar syrup, cooling  and folding with whipped double cream).
Layer the vanilla on top of the chocolate, level and whack it back in the freezer again.
When ready, unmould from the tin onto a plate and place back in the freezer. When ready, slice with a hot knife to serve.
I'm SO making this. I'm going to involve nutella as well.