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1
Melt the butter in a large pot over medium heat. Add the onions and fennel and saute until translucent, 10 to 15 minutes. Add the flour, reduce the heat to low, and cook for 3 more minutes, stirring occasionally. Slowly add the stock, Sherry, tarragon, salt, and pepper, and bring to a boil. Simmer for 5 more minutes, stirring occasionally. Add the heavy cream and season to taste. The sauce should be highly seasoned.
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2
Cook the potatoes in boiling salted water for 10 minutes. Drain well. Add the potatoes, mixed vegetables, onions, and parsley to the sauce and mix well. Simmer 5 minutes
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3
For the pastry, mix the flour, salt, and baking powder in the bowl of a food processor fitted with a metal blade. Add the shortening and butter and mix quickly with your fingers until each piece is coated with flour. Pulse 10 times, or until the fat is the size of peas. With the motor running, add the ice water; process only enough to moisten the dough and have it just come together. Dump the dough out onto a floured board and knead quickly into a ball. Wrap the dough in plastic and allow it to rest in the refrigerator for 30 minutes.
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4
Preheat the oven to 375 degrees F.
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5
Divide the pastry into quarters and roll each piece into a 12 inch circle. Line 2 pie pans with a pastry circle. Divide the filling equally among the two pie pans. Top each with remaining pastry circles. Trim the circle to 1/2-inch larger than the top of the pan. Crimp the dough to fold over the sides, pressing it to make it stick. Brush the dough with egg wash and make 3 slits in the top. Sprinkle with sea salt and cracked pepper. Place on a baking sheet and bake for 45 min - 1 hour, or until the top is golden brown and the filling is bubbling hot.
