This is a very strange thread.
"Italian Pastry Cream," aka crema pasticcera aka zuppa inglesa is just plain, old creme patisserie. You don't need to use powdered milk or fake vanilla. In fact, you shouldn't. Use best quality, fresh, whole milk and real vanilla and you'll get a superior creme. If you want some sort of Italian accent you could slip a little lemon zest into it.
The shells ou're talking about are probably made from frying ordinary choux paste. (Ed confused one kind of puff pastry -- the millefiuelle kind -- with choux. I gather the the total effect would be a sort of eclaire in a fried shell. I'm not Italian, not from the east coast, etc., but the bigne di San Giuseppe I'm familiar with are made with baked shells -- not fried.
In chemistry "vanillin" (with an "i") is the molecule in vanilla that has nearly all the vanilla flavor and aroma. In cooking, "vanillin" is artifical vanilla flavoring made with the chenically synthesized vanllin molecule. Large bakeries buy it in a nearly pure form. But you can find it sufficiently diluted for home baking as cheap "vanilla extract" in any super. No better. No worse. No Difference. Alla time same same.
That said, vanillin and real vanilla are not at all the same. The difference is definite.
Why anyone with the option to use real vanilla would choose artificial is beyond me. If you think the smell of vanillin is intoxicating you're probably overwhelmed by concentration -- as opposed to quality. Try getting yourself a paper bag, splitting a couple of quality beans and huffing them (joke only, closed course, trained professional stunt monkeys, kids don't try this at home).
If someone wants me to post recipes for crema pasticcera and choux paste, I suppose I can. But there are very good recipes all over the net, and mine are nothing special.
Hope this helps,
BDL
Edited by boar_d_laze - Yesterday at 9:25 am