Preheat the oven to 400 degrees F.
Grease and line 2 baking sheets with parchment paper. Greasing the baking sheet first will hold the parchment paper in place while piping the pastry dough.
In a medium saucepan, add the water, butter, sugar, and salt and bring to a boil until the butter melts.
Add in the flour and baking powder beating vigorously with a wooden spoon until combined. The flour will absorb all the liquid and form a ball.
Continue cooking and stirring the mixture for about 2 minutes as this will get rid of the raw flour taste.
Transfer the dough to a mixing bowl and beat for about 1 minute. This allows the dough to cool slightly before adding the eggs.
Beat in the eggs one at a time, beating well after each addition. Stop to scrape down the bowl if needed.
When ready, the dough will be thick and smooth looking.
Spoon the dough into a large pastry bag fitted with a star tip. (I used the 1M star tip)
Pipe a rosette of, 2¼ inches in diameter directly onto the parchment lined cookie sheet and top with a second layer of rosette. Basically one on top of the other. It will have the appearance of a bird's nest.
Repeat with the remaining dough while spacing the rosettes 2 inches apart.
Bake for 25 to 30 minutes. The pastries should have a golden-brown colour. (Mine were ready in 30 minutes)
Allow the pastries to cool completely before filling with the custard.
When ready to serve, dust the pastries with powdered sugar.
Spoon the chilled pastry cream into a piping bag fitted with a star tip and pipe swirls of pastry cream over each zeppole and top with an Amarena cherry.
Serve and enjoy.