Mix one half of the pastry cream recipe with 1 large tablespoon of pistachio cream. Add the food coloring if using, and fold gently.
Whip the cream and confectioner's sugar until very stiff. Fold the cream into the pastry cream mixture until uniform in color.
Prepare the zeppole by filling the center with the plain pastry cream, as in the original recipe, but pipe the top with the pistachio cream, then sprinkle with chopped pistachios.
Notes
Only add food coloring if you need the green color to be more prominent.
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