01 -
Combine all-purpose flour, kosher salt, and granulated sugar in a food processor. Pulse briefly to mix. Add cold cubed butter and pulse 5 to 6 times until mixture resembles pea-sized crumbs.
02 -
Gradually add 3 tablespoons cold water, pulsing until dough begins to come together; add remaining tablespoon of water if needed to bind. Transfer dough to a work surface, shape into a disc, wrap in plastic, and refrigerate for at least 1 hour.
03 -
On a lightly floured surface, roll dough to fit a 9-inch pie pan. Carefully line the pie pan with the dough, trim any excess, then crimp the edges. Chill crust while preparing the filling.
04 -
Blend all-purpose flour, packed dark brown sugar, ground cinnamon, ground nutmeg, kosher salt, and cold cubed butter in a bowl. Use fingertips or a pastry blender to combine until mixture forms coarse crumbs.
05 -
In a large bowl, whisk together molasses and hot water until smooth. Mix in baking soda and one third of the crumb topping (approximately 3/4 cup) until just combined.
06 -
Pour the liquid mixture into the prepared pie crust. Sprinkle remaining crumb topping evenly over the surface.
07 -
Bake in a preheated 375°F oven for 30 minutes, or until the filling is set and crumb topping is golden. Allow pie to cool before slicing and serving.