Caramelized Onion without seed plum canola

2 tablespoons extra-virgin olive oil 1 medium red onion, thinly sliced 2 tablespoons balsamic vinegar 1/4 teaspoon salt 1/4 teaspoon freshly ground black[...]

12 ounces refrigerated fresh pizza dough 4 teaspoons olive oil, divided 2 cups vertically sliced yellow onion 1 cup vertically sliced red onion 1 cup[...]