Passion Fruit Ice Cream Pie with a Ginger Crust

In a food processor, combine the crushed gingersnaps with the pineapple, candied ginger and butter and process until fine crumbs form. Press the crumbs evenly over the bottom and 1 inch up the side of a 9-inch springform pan. Freeze until firm, about 10 minutes. In a blender, blend the dulce de leche and passion fruit nectar until smooth. Spread 1 pint of ice cream in the chilled crust. Using a very small ice cream scoop (2 tablespoons), scoop the remaining 2 pints of ice cream into the crust, leaving some nooks and crannies. Drizzle 3/4 cup of the dulce de leche sauce over the ice cream, allowing it to pool in spots. Sprinkle with the pistachios and coconut and freeze until firm, at least 2 1/2 hours. Remove the ring and cut the pie into wedges. Serve the extra dulce de leche sauce at the table.