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Crostata: In the bowl of a food processor, combine the flour, sugar, salt and lemon zest. Pulse the mixture to blend. Add the butter and continue pulsing to integrate and give the dough the consistency of a "gravel driveway."
With the processor running, pour 2 tablespoons of ice water through the hole in the top of the machine and process until the dough looks like wet sand, adding more water if necessary, until it finally gathers into a ball.
Remove the dough from the food processor and flatten it between 2 pieces of floured parchment paper on a baking sheet. Chill and allow it to rest for about 30 minutes. Roll the dough out to 1/4-inch thickness and cut out 8 (5 1/2-inch) circles. Make sure you lightly flour under and over the dough as you roll it.
Preheat the oven to 350 degrees F.
Brush any excess flour off the dough before putting a spoonful of the cooled ganache in the center of each circle. Fold the sides up around it, making the chocolate the center of a small "money purse." Arrange them in a single layer on a baking sheet and bake until golden brown, about 12 to 15 minutes. Remove from the oven to a serving platter. Put any remaining ganache in the cavities of the crostada. Serve immediately with sour cream, whipped cream, or ice cream, if desired. Sift some powdered sugar over the crostata and garnish with a pinch of ground cloves, if desired.