Spread/roll the pizza dough until it's about ½ inch thick then transfer to a parchment lined baking sheet. Cover and let rise 10 minutes.
Drizzle the olive oil over top and massage it into the dough, tucking a little of the oil under the edges of the dough too.
Let the dough rest 10 minutes. Meanwhile preheat the oven to 400ºF.
Sprinkle the granulated sugar over the oiled focaccia dough and scatter the grapes over top and then the leaves of rosemary (discard stems). Top with turbinado.
Bake for a good 30 minutes, until it is a nice golden brown color. Let cool slightly before slicing and serving.