In a large bowl, combine the flour, sugar, salt, and dry yeast.
Warm the milk until lukewarm, then add the melted butter, orange juice, and grated orange zest.
Whisk the eggs and add them to the wet ingredients. Pour the wet ingredients into the dry ingredients and knead until you get a smooth, elastic dough.
Cover the dough with a clean kitchen towel and let it rise in a warm place for 1 hour, or until doubled in size.
On a floured surface, roll out the risen dough to about 1 cm thickness. Use a glass to cut out circles. Use a smaller cutter to cut out the center of each circle.
Heat the oil in a large saucepan to 340°F (170°C). Fry the doughnuts until golden brown, about 2-3 minutes on each side.
Place the fried doughnuts on paper towels to drain excess oil.
Before serving, sprinkle the doughnuts with powdered sugar and decorate with orange zest or chocolate sauce, if desired.
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