Bomba italian doughnuts

Place the flour, sugar, instant yeast and zest into a large mixing bowl. Slice the vanilla bean in half lengthwise and scrape to remove the seeds, add the seeds to the flour mixture.
Make a well in the flours and add the warm milk. With a wooden spoon mix the ingredients together. Alternatively, you can use your kitchen aide mixer with the dough hook attachment to prepare your dough.
Add the eggs all at once and mix until a soft ball forms.
Add the butter in small pieces a little at a time.
Transfer the dough to a floured surface and knead for 10-15 minutes. The dough should be a little soft but not sticky.
Place the dough in a well oiled mixing bowl, covered with plastic wrap and in a warm window until doubled in size, about 1 1/2 to 2 hours.
Punch the dough down lightly and roll out on a lightly floured surface until a 1/2 inch thick. Cut the dough with a 3 inch cookie cutter and place on a cookie sheet
Take the leftover dough and roll into a ball. Place the dough back into the oiled bowl to rise for another 1/2 hour or so. Roll the dough out and repeat the process.
When all the dough has been used let the rounds raise again covered and in a warm place until doubled in size.
Fill a large pot with enough oil until it is 3-4 inches deep. Heat the oil to 340 degrees. Fry the doughnuts until golden brown.
You may use a pastry bag with metal tip to fill the doughnuts with Nutella or just serve Nutella alongside the warm doughnuts and start dipping.