CRUMBLE
In a small bowl, melt butter then add flour, sugar, brown sugar, and salt, mixing with a fork until it turns into large crumbs. You may want to use your hands.
Place in the refrigerator while you make the pie. This step is really important to make sure the butter is cool enough that the crumble won't melt and bake into the pie.
Thaw the frozen blueberries and then rinse, strain, and blot with a towel to get off excess water
Toss blueberries in lemon and sugar and set aside
Strain the pears and blot with a towel
Remove one of the crusts from its pie pan and on a lightly floured surface, roll out into a circle large enough to cover the first layer of pie with enough crust to hang over the edges of the pie pan by about an inch.
Add blueberries to the first crust and spread across bottom of the crust in the pie pan
Lay the rolled-out crust over the top of the blueberries and pinch the hanging edges of the pie dough together with the crust from the first layer - you should now have one thick crust.
Add pears on top of the second crust and sprinkle with nutmeg, and cinnamon, drizzle honey, and then squeeze lemon juice on top
Add half of the crumble on top of the pears, and bake at 400 degrees for 25 minutes. Put the rest of the crumble back into the refrigerator.
Lower the temperature to 375, sprinkle the remaining crumble on top, then cover the edges of the crust with tin foil (leaving the middle of the pie exposed) to make sure they don't burn, then bake another 45-50 mins.
If the crumble starts to get too brown loosely cover the entire pie with a large piece of tin foil. Depending on your oven, you may need to bake it longer until the middle layer of dough is fully cooked. Remove from oven and place on a wire rack to cool
Cut into slices using a sharp knife and a spatula to remove each piece from the pan