Preheat your oven to 350°F (175°C).
In a large mixing bowl, whisk together the eggs until light and fluffy, then add pumpkin puree, brown sugar, cinnamon, nutmeg, ginger, and salt. Mix thoroughly before adding bourbon and evaporated milk.
Place the unbaked pie crust into a 9-inch pie pan and pour in the prepared pumpkin filling.
Melt unsalted butter in a saucepan over low heat until browned. In another bowl, combine brown sugar, flour, and sea salt, then mix in the browned butter until crumbly.
Stir in coarsely chopped pecans into the streusel mixture and sprinkle evenly over the filled pie.
Bake for approximately 50 minutes or until set and golden brown on top. Allow to cool slightly before serving.