New Cheese Cake

Around the world there are so many varieties’ of cheese cake. Now there is one a more’! This recipe can seem a little complicated, I remain at your disposal for any clarification.
Ingredients 100% (net amount) for a siphon ½ liter:
230 g Philadelphia
150 g custard
60 ml fresh cream
cans nitrogen n. 1
Custard:
20g caster sugar
35 g (n. 2) yolks
30 ml fresh cream
80 ml milk.
For the wafers of pastry with walnuts:
125 g flour 00
50 g butter
40 g caster sugar
1 egg
Chopped walnuts q.s
Mixed berries procedure:
For the wafers of pastry with walnuts:
Mix butter and sugar, add the flour and eggs in the past.
Form a cylinder 4 cm in diameter and break down to -18C °
Pass the frozen crust with a coarse grater and form of thin discs with a diameter of 5 cm., Just sprinkle with chopped nuts and bake at 170C ° for 3-4 minutes.
For the custard: Bring cream and milk to a boil, meanwhile mix the sugar and egg yolks.
Combine the two mixtures, put on the fire and bring to 84 ° C while stirring constantly with a lick pots.
Block immediately immersing the cooking pan in ice water.
In a bowl with a whisk to work the Philadelphia, diluted with 150 g of custard then stir in the cream is not whipped. Pour the mixture into the siphon, charge with nitrogen and shake well. Store in a refrigerator at 2 ° C. presentation: 
Trap at a dollop of cream cheese in the dish, place a wafer and then finish with another dollop of cream. Decorate with berries and sauce