On a marble worktable stretch and flatten out the dough to about 1/4-inch thick. Place the dough onto a greased baking tray leaving 1/2 of the dough off the pan. Add 1/2 the grapes and squish the grapes with your hands to release the juices into the dough. Sprinkle 1/2 cup sugar and add 1 rosemary sprig. Drizzle the dough with 1 1/2 tablespoons olive oil.
Gently fold over the remaining dough over the grapes and pinch down the ends. Repeat the process using the remaining grapes, sugar, rosemary, and olive oil.