Caramelized Onion Pizza Recipe

0 If you are using fresh store-bought or homemade dough that has been refrigerated, set it out on a lightly floured surface and let it rest for 30 minutes before making your pizza. (The gluten in the dough will relax as it comes to room temperature and the pizza will be easier to work with.)
1 Caramelize onions: Heat a large skillet with olive oil (portion for onions) and butter over medium-high heat. Add the onions and cook for about 5 minutes, stirring occasionally, until they start to soften. Sprinkle onions with salt and sugar (if using). Reduce the heat to low-medium and continue to cook onions, stirring often, until they are dark golden brown and super tender, 25 to 30 minutes. 
2 Preheat the oven to 500°F / 260°C. (If using a pizza stone, make sure the stone is in the oven as it heats.)
3 Prepare the pizza dough by stretching it out on a sheet pan or on the counter (if you are using a pizza stone / pizza peel). 
4 Drizzle the pizza dough with 3 tablespoons of olive oil. Top with cheese, onions, and rosemary.
6 Bake the pizza until crust is golden brown and cheese is melted, 8 to 11 minutes. 
7 Slice and serve.