Pie Crust:
2 1/2 c. unbleached all-purpose flour
1 tsp salt
1 tbsp. sugar
20 tbsp. unsalted butter, cut into 1 in pieces
3 oz. Gruyère, grated finely
6 to 7 tbsp. ice water
Filling:
3 lbs. Bartlett pears
1/4 c. white sugar
3/4 c. port wine
1 1/2 c. water
2 tsp. cornstarch
2 tsp vanilla
1/2 tsp. ginger
1/4 tsp. nutmeg
1/4 tsp clove
1 cinnamon stick
1 egg, lightly beaten (for crust)