Whip the cream but do not reach the maximum whipping, keep it semi whipped and soft.
Separately whip the egg whites very slowly with 30 g of sugar (of the 150 g).
Prepare a syrup with the remaining 120 g of sugar, water and the seeds of the vanilla bean.
Bring the syrup to 117/121 ° C and then slowly pour it continuously into the egg whites that will be whipping.
Increase the speed and make it fit well.
If so, we can add some lemon juice to make the mixture whiter.
You will have just obtained the Italian meringue.
Add the cold meringue to the cream and mix gently.
Divide the mixture into molds and put in a blast chiller (or freezer).
You can choose single-portion silicone molds or a single large mold where you will then go to obtain the slices
To prepare the flambé berry soup:
Put the berries and sugar in a non-stick pan and add a few tablespoons of water.(be careful, if you use fresh berries add a few tablespoons of water if you use frozen berries instead, avoid adding water as they will release it already in the pan)
Once the pan and the mixture are hot, add the Grand Marnier and flame them.(To flambé the berries add the Grand Marnier, with a lighter, better if it is a long "stem" kitchen lighter, bring the flame close to the berries with a quick movement, the berries will begin to ignite, wait for the flame to extinguish by itself, in this way you will have flamed them. Pay close attention in this step!)
Turn out the parfait on a plate and add the warm soup and decorate with white chocolate flakes.
Notes
In case you want to surprise your guests you can serve the parfait on the plate and pass with a hot berry soup gravy boat and pour it in front of each guest.
They will be pleasantly surprised to see the slight smoke that is created when the hot soup comes into contact with the frozen parfait.