For the custard cream
3 egg yolks
3 tablespoons (30 gr) of all-purpose flour
1/2 cup (100 gr) of sugar
1 teaspoon of vanilla extract
8 oz (235 ml) of milk
For the cannoncini
1 sheet of puff pastry, defrosted (about 8 oz, 225 gr)
1/4 cup (50 gr) of sugar
1 egg (for egg wash)
powdered sugar to decorate
Start by preparing the custard cream (crema pasticcera):
Warm up the milk until hot (not boiling).
In a medium sized pan, whisk the egg yolks with the sugar, vanilla extract and flour, until light and fluffy.
Add the milk some at a time while whisking, making sure there are no lumps.
Place the pan over medium heat and stir continuously until it reaches a slow boil. The cream will thicken, so be careful not to let it stick to the bottom. Lower the flame and cook for a couple of more minutes, until you reach the desire thickness.
Pour the cream in a glass bowl, cover with plastic wrap and let it cool down. Refrigerate for at least one hour.
For the pastry horns:
Preheat the oven to 400°F (200°C).
Sprinkle some sugar on the counter and on top of the puff pastry and roll it out to a rectangle about 9 by 12 inches.
Cut into 12 stripes (about 1 inch thick). Easy way to do it: cut the pastry in three parts, and then each part into four strips.