01 -
In a large bowl, whisk together salt and flour. With a pastry cutter or by hand, combine flour and cubes of butter until butter crumbles are the size of peas. Add ricotta, lemon, and water to the flour mixture, then mix just until combined (don't over work the dough, it should hold together loosely). Shape into a ball, flatten slightly to form a thick disc, wrap with plastic wrap, and refrigerate for at least 1 hour (or freeze for 15 minutes).
02 -
Gently combine blueberries, cornstarch, sugar, lemon, and salt in a bowl.
03 -
On a floured surface, roll dough into a 12 to 14 inch circle. Transfer to a parchment paper-lined baking sheet and spread ricotta evenly, leaving 2 inches free around the edges. Spoon blueberry mixture over the ricotta, gently pressing down to flatten. Fold the outer dough over the blueberries, brush the dough with whisked egg for a shiny golden finish, and sprinkle with a bit of sugar.
04 -
Bake at 204°C (400°F) for 30 to 40 minutes, or until crust is golden brown.