01 - Preheat the oven to 350°F. Grease a 9-inch tart pan with a removable bottom.
02 - Combine flour, sugar, and salt in a bowl. Rub in cold butter with fingertips until coarse crumbs form. Stir in egg yolk and just enough cold water to bring dough together.
03 - Press dough evenly into tart pan and prick base with a fork. Chill in refrigerator for 15 minutes.
04 - Bake crust with weights for 15 minutes. Remove weights and bake an additional 8 minutes until lightly golden. Allow to cool slightly.
05 - Melt butter in skillet over medium heat. Add pears, brown sugar, cinnamon, and lemon juice. Sauté for 5 to 7 minutes until pears are just tender. Let cool slightly.
06 - Heat heavy cream in saucepan until just simmering. Remove from heat, add chopped chocolate and butter, stirring until smooth.
07 - Spread ganache evenly in cooled crust. Arrange warm pears on top attractively.
08 - Return tart to oven for 8 to 10 minutes to warm through. Serve slightly warm.