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Preheat oven to 350°F.
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Spread 1/2 cup of the pecans on a baking sheet and toast them in the oven for 8 to 10 minutes, until lightly browned and fragrant.
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Let cool completely.
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Place the roasted nuts in a food processor and process until smooth and buttery.
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Add the flour and pulse until incorporated.
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Scrape into a large bowl and set aside.
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Heat the butter in a small saucepan over medium-high heat until it starts to foam and turns a light brown.
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Remove from heat and set aside.
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Add the brown sugar, corn syrup, eggs, vanilla, and browned butter to the nut paste and stir until well blended.
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Fold in the remaining 5 cups pecans.
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Pour the filling into the pre-baked pie shell.
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Bake for 30 to 40 minutes, until the filling is slightly puffed and the crust is golden brown.
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Transfer to a rack to cool.
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Serve warm or at room temperature.