Mix the ricotta and eggs together until well combined. Add the citrus rind, buttermilk or milk, flour, baking powder (or Pane deli Angeli) and mix well.
Stir in the soaked raisins. (Only add the chocolate on the inside of the doughnuts so it doesn't make contact with the oil.)
Heat the oil over medium high heat, and test a little piece of dough to see if it is hot enough, without burning the dough, before frying the rest of the doughnuts.
When brown, remove the doughnuts and place on a paper-towel-lined plate. Roll in sugar before they are completely cool.
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