Roll out dough and cut to the pie pan. Flute or crimp edges or braid extra pie dough into a thin braid and affix with a bit of the egg wash. Place the pie shell on a larger cookie sheet and bake until the crust is set and barely golden brown, about 15 minutes.
While the crust parbakes, mix together the sugar, salt, spices, pumpkin, eggs, and half and half. Pour the filling into the crust, brush the edges with the egg wash, and return to the oven. Bake for 15 to 20 minutes or until the filling is a little set (read: very wiggly, but not watery). Gingerly distribute the halvah crumbles on top of the filling. Return to oven and continue to bake until the filling is completely set. Cool completely before slicing and serving.