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.
Cook for approximately 20 minutes.