Authentic Pennsylvania Dutch Shoo Fly Pie

OK it will not let me post this under deserts topic so I will put it here.
This is from a 90 year old Amish woman that happens to be a neighbor of mine.

Recipe Name: AUTHENTIC PENNSYLVANIA DUTCH SHOO FLY PIE
Category: PIES
Serves: 8

1/2 Cup Baking Molasses
1 each Egg Yolk
1/2 tsp Baking Soda
3/4 Cup Boiling Water
3/4 Cup Flour
1/2 Cup Brown Sugar
2 tbsp Butter
1/8 tsp Nutmeg
1/8 tsp Ground Ginger
1/8 tsp Ground Cloves
1/2 tsp Cinnamon
1/4 tsp Salt
1 each Pastry for 9 inch pie

Line 9 inch pie plate with pastry. Mix molasses and egg yolk.
Dissolve soda in boiling water and add to egg and molasses. Set aside.
Stir dry ingredients together, mixing well. Cut in shortening until
mixture looks like coarse crumbs. Pour molasses into pie shell. Sprinkle
crumbs evenly over top. Do not stir. Bake at 450 degrees for 15 minutes
then reduce heat to 350 degrees and bake 20 minutes longer. Cool and
serve.