Beat ricotta cheese and 1 1/2 cup confectioners' sugar together in a bowl until smooth. Stir in mixed peel and chocolate. Cover and refrigerate for 3 hours.

Mix flour, Marsala wine, butter, sugar, and vinegar together in a bowl to make cannoli dough. Wrap in plastic wrap; let rest for 30 minutes.

Knead dough on a lightly floured work surface until smooth. Roll to 1/8-inch thickness. Cut into twenty 4-inch squares. Wrap each square around a metal tubular mold, overlapping ends and dabbing with warm water to seal.

Heat oil in a large saucepan over medium-high heat. Lower some cannoli molds into the hot oil; cook until shells are golden and crisp, about 10 minutes. Drain on paper towels. Repeat with remaining cannoli molds. Cool briefly; twist molds carefully to remove shells. Let shells cool completely, about 15 minutes.

Fill cooled cannoli shells with ricotta filling using a spoon or piping bag. Arrange cannoli on a serving platter. Garnish with pistachios; sprinkle 2 tablespoons confectioners' sugar on top.