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Basically, all you need is a good vanilla custard, yes, with vanilla beans. Costco sells them. Note: Store your vanilla beans in an airtight container and check on them. They can go all funky on you:
Once you have your custard, prepare your puff pastry according to the package. I cut mine into small rectangles but I've seen these in the shape of hearts or circles.
Toss some sliced strawberries in a bit of sugar and Grand Marnier (optional.)
And then assemble! Note: Don't assemble these too far in advance or they will grow soggy, and they just won't do.