My Bomboloni are soft, airy, and filled with a sweetened pastry cream. These Italian doughnuts taste better than anything you can get from your local bakery.
In a large bowl combine flour, sugar, and yeast. Top with cubes of softened butter, eggs, milk, salt, and vanilla.
Knead for 5-10 minutes until dough is smooth and elastic.
Shape into a ball. Place in a lightly greased bowl. Cover and allow to rise in a warm place for 2-3 hours or until it is tripled in size.
Punch dough down and then roll into a rectangle around ½ thick.
Use a medium biscuit cutter to cut out doughnuts. Place on a parchment lined baking sheet and cover with plastic wrap. Allow to rise for 1-1 ½ hours or until nearly tripled in size.
In a deep pot, heat oil to around 337 degrees. Fry for around 2 minutes a side or until golden brown.
Drain on a wire rack for 1-2 minutes before rolling in powdered sugar.
For the Cream Filling
In a large bowl, combine egg yolks, sugar, vanilla, and lemon zest. Stir in cornstarch.
In a medium sauce pan, heat milk until warm. Turn off heat and allow to sit for 1-2 minutes.
Add warm milk a little at a time whisking constantly.
Return to saucepan over low heat. Stir constantly for 10-15 minutes or until thick and creamy.
Pour into a clean bowl to cool. Press plastic wrap on top.
Insert a small knife into the side of a doughnut and move it around to make a pocket to place the filling.