Preheat the oven to 375 F.
Soak the raisins for 15 minutes with hot water. I like doing this step so that the raisins soften up a little. Pat them dry completely once soaked. You can do this while the crème is cooling up to save time.
Assemble the pastries: Lay a sheet of puff pastry on a cutting board. Then spread custard evenly on the pastry sheet. I used 1/2 cup crème patissiere for each sheet. You can use a little more if you like, but keep in mind that the inside of the pastry will be more moist when you bake it.
Top the crème with 1/4 cup of golden raisins. Cut the pastry sheet into 8 even 1 inch strips.
Start by rolling one strip to form a roll. Then take a second strip and roll again around the first roll. Each sheet should make you 4 raisin pastries.
Brush pastries: Transfer the portions to a sheet pan lined with parchment paper. Brush each roll well with the some of the leftover egg whites.
Bake: Bake the pastries until the pain aux raisins are golden brown in color, between 28-30 minutes, depending on your oven. Mine took 28 minutes.
Right before the pastries come out of the oven, microwave the apricot preserve for 30 seconds with 2-3 tsps. of water in a small bowl. Mix well.
Glaze: When the pain aux raisins come out of the oven, brush them with the apricot glaze.
Allow them to slightly cool before eating. I prefer eating them fresh while they are still a little warm.