1. To make the crust: Pulse the flour and salt in a food processor briefly. Add the butter and pulse until the mixture resembles coarse cornmeal with a few bean-size bits of butter. Drizzle over the 3 tablespoons ice water and pulse once or twice; don't let the dough form a mass around the blade. Remove the blade and bring the dough together by hand. Shape the dough into a disk, wrap in plastic wrap, and refrigerate 1 hour.
2. To prepare the filling: Season the chicken with salt and pepper. Melt the butter in a large skillet over medium-high heat. Add the onion and cook, stirring, until translucent, about 2 minutes. Stir in the potatoes and carrots and cook stirring often, for about 5 minutes. Add the flour and curry powder and cook 1 minute longer. Pour in the broth, increase the heat to high and bring to a boil. Bring back down to a simmer and continue to cook until the potatoes and carrots are almost cooked through, about 5 to 7 minutes. Stir in the chicken and cook just until the chicken is firm, about 2 minutes. Add the peas and raisins. Season with salt and pepper. Pour into a 10-inch wide deep-dish pie plate. Cool slightly before proceeding.
3. Preheat the oven to 400 degrees F. On a floured surface, roll the dough into a shape that is about an inch larger than the top of the baking dish. Roll the crust around the rolling pin and unroll it over the top of the baking dish. Pinch the edges to form a smooth edge, pressing against the inside of the rim. Cut slits in the center and in 1-inch intervals around the outer rim to allow the steam to escape. Stir the egg yolk and cream to blend and gently brush over the pastry to glaze. (The dish can be prepared up to 2 days to this point, covered and refrigerated.)
4. Place the pot pie on a baking sheet to catch any overflow and bake until the crust is golden brown and the filling is bubbly, about 30 minutes. Let rest for 5 minutes before serving.
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