For crust: Mix sea salt, butter, and flour together in a large bowl with your hands or pulse in a food processor--until a coarse meal forms. Add cold water and continue to work with hands or pulse until dough forms. Separate into two equal pieces, form each piece into the shape of a hockey puck, wrap in plastic wrap, and refrigerate for 30 minutes or more.
Meanwhile, mix all filling ingredients and set aside. Preheat oven to 350 degrees.
Once chilled, roll out pie crusts on a floured surface. Press bottom crust into a 9-inch pie pan then add filling. Place top crust over filling, press edges, and cut away any that hangs over edge of pan. Roll these scraps together to make your decoration.
Brush with egg yolk, if desired, then tent with a piece of foil to prevent crust from burning. Bake for about an hour.
Remove from oven and allow to cool for at least an hour before cutting.