For the pastry:

1. place the flour, sugar, and salt in the bowl of a food processor fitted with a steel blade.
2. Pulse a few times to combine.
3. Add the butter and pulse 12 to 15 times, or until the butter is the size of peas. With the motor running, add the ice water all at once through the feed tube. Keep hitting the pulse button to combine, but stop the machine just before the dough becomes a solid mass.
4. Turn the dough onto a well-floured board and form into a disk. Wrap with plastic and refrigerate for at least 1 hour.

*You don’t need a food processor for this! You can mix together the flour, sugar, and salt then cut the butter into it using a pastry cutter or two butter knives.  Then slowly pour in ice water one tablespoon at a time while gently stirring with a fork.  When dough begins to come together in a loose ball then turn dough onto a well-floured surface and form into a disk.  Handle dough as little as possible.

1. Preheat the oven to 450 degrees F.
2. Flour a rolling pin and roll the pastry into an 11-inch circle on a lightly floured surface. Transfer it to a baking sheet.

For the filling:

1. peel, core, and cut the apples and pears into 8ths. Cut each wedge into 3 chunks.
2. Toss the chunks with the orange zest.
3. Cover the tart dough with the apple chunks leaving a 1 1/2-inch border.
4. Combine the flour, sugar, salt, cinnamon, and allspice in the bowl of a food processor fitted with a steel blade. Add the butter and pulse until the mixture is crumbly. (again, you can do this with a pastry cutter.)  Pour into a bowl and rub it with your fingers until it starts holding together.
5. Sprinkle evenly on the apples.
6. Gently fold the border over the apples to enclose the dough, pleating it to make a circle.
7. Bake the crostata for 20 to 25 minutes, until the crust is golden and the apples and pears are tender. Allow to cool. Serve warm or at room temperature with a scoop of vanilla bean ice cream.