Makes 24 (3-inch) pizzettes
Heat 1 tablespoon of the oil in a large skillet over medium heat. Add the onion and cook for 3 minutes. Add the grapes and cook for 7 minutes more, stirring occasionally, until onion and grapes are soft. Add balsamic vinegar and simmer, stirring often, until vinegar has evaporated almost completely (when you tilt the pan, no liquid should run along the bottom). Season with salt and pepper and set aside.
Place the dough on a lightly floured surface, sprinkle with flour and roll into a 14- to 16-inch round. Flour a 3-inch biscuit cutter and cut as many circles out of the dough as you can. Transfer circles to the prepared baking sheets, quickly gather the scraps, re-roll and cut more circles.
Drizzle or brush the pizzettes with the remaining 2 tablespoons of olive oil and sprinkle with cornmeal if using. Top each pizzette with a teaspoon of grape compote. At this point, you could chill the pizzettes, covered with plastic wrap, for a few hours, then take them straight from the refrigerator to the oven, adding an extra minute or so to the baking time.
Bake the pizzettes for 10 minutes or until the edges are lightly browned. As soon as they come out of the oven, sprinkle with Gorgonzola and top with a basil leaf. Sometimes I add the cheese before baking, but it retains its texture and strong flavor better if you wait until after. Serve immediately.
Other Ideas for Pizzettes:Sliced mixed mushrooms sauteed with scallions, garlic and a few dashes of soy sauce; grated Fontina cheese and chives.
Sauteed diced eggplant or zucchini, tomatoes and onion with a dash of red wine vinegar; crumbled feta cheese and mint.