For the filling:
Combine the blueberries, brown sugar, lemon juice and lemon zest in a bowl. Set aside and allow to macerate for 20 minutes.
Add the flour and salt to the blueberry mixture. Stir until all of the flour is combined.
For the crust:
Preheat oven to 375°. In a medium-size bowl, mix the flour, corn meal, sugar and salt. In a small bowl, whisk the oil and milk together. Pour the oil mixture into the dry ingredients. Mix with a fork until completely combined. With your fingers, push the crust mixture into the bottom and up the sides of a 9-inch pie pan. Place the blueberry filling into the crust and bake for 20 minutes.
For the topping:
Use a fork to combine the flour, corn meal, sugar and butter until it resembles coarse meal. After the 20-minute period has passed, turn oven down to 350°. Remove the pie and sprinkle the topping over it. Return to oven and bake for another 25–30 minutes, until the middle is beginning to set up.
During this time, whisk the mascarpone cheese with the maple syrup, nutmeg and cream until light and fluffy; chill.
Serve the pie with a spoonful of the mascarpone mixture on top.
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"We like it best warm from the oven, with milk on top."