Le parfait d'armangnac aux pruneaux

Frozen prune mousse with armangnac (with commentary)

450g best quality presoaked dried prunes, stoned (I got a packet from the shops, that were soggy in their bag already, stoned, and they seemed to work fine. Perhaps Oz has better access to prunes?)
a few strips of lemon zest (I could have gone a little heavier on this I think)
4 tbsp armagnac (I used brandy. Couldn't get armangnac)
500ml thick double cream
whites of two large eggs
2 tbsp caster sugar
a pinch of salt


Soak the prunes with the lemon zest and armangnac for an hour or so. Remove lemon zest and whizz prunes and armangnac in food processor until a puree.
Whisk egg whites with salt until stiff, then add sugar. (And then whisk some more? The recipe says nothing. I whisked, and don't think it did any harm.)
Whisk the cream until it has a floopy consistency. (Why? Surely thick double cream has been beaten enough already? I had to be careful not to make butter)
Carefully fold the prune puree into the cream and then, with a wooden spoon, fold in the stiffened egg whites. (I think all the egg whites are doing is cutting the thickness of the cream. I may be wrong)
Spoon into individual serving pots and place in the freezer for no more than 2 hours. (it says 6-8 serves - I filled 10 espresso mugs, and then a small pyrex dish, and had plenty of bowl to lick. No idea how big their pots are!)