Preheat oven to 450. Roll out dough on lightly floured surface to 12″ round. Transfer to large baking sheet. Sprinkle dough with 2 tablespoons sugar. Place lemon pieces on dough, leaving 1 1/2″ border. Sprinkle 2 tablespoons sugar over lemon pieces. Fold dough border in over lemon pieces; press edges lightly to seal. Bake until crust is golden, piercing through lemon pieces with toothpick if crust bubbles, about 25 minutes. Cool tart completely. Can be made 4 hours ahead