Choose your pie crust. If making it from scratch, keep it in the fridge while you make the filling.
Preheat oven to 350 degrees.
Prepare the filling. In a large bowl, combine chopped pears, cranberries, and lemon juice. Toss to coat.
In a small bowl, combine sugar, flour, cinnamon, ginger, nutmeg, and cardamom.
Pour dry ingredients over fruit mixture and mix well to evenly coat.
Pour fruit filling into pie crust and place in fridge while you assemble the crumb topping.
To make the crumb topping, begin by melting the butter in the microwave and then setting it in the fridge to cool for a minute or two while you mix up the other ingredients.
In a medium-sized bowl, combine the brown sugar, flour, cinnamon, and cardamom. Pour the cooled butter in and mix well to resemble crumbs.
Remove pie from fridge and top with crumble topping. Slightly press down the crumb topping to make it all stick.
Bake pie on the center rack for 50-60 minutes. The fruit juices should be bubbly, crumb topping a nice brown, and crust edges just golden. If the crust or crumb starts to get too dark, cover with a tent of foil.