Heat oil for a minute over medium-high flame in an 8-quart soup pot; add pancetta. Cook, stirring, for a few minutes or until pancetta is crisp and cooked through. Remove pancetta to a small bowl and reserve, leaving fat in pot. Tip in the onion, carrot, celery, and garlic; season with 1 teaspoon kosher salt, ½ teaspoon fresh ground pepper, and the rosemary. Sauté, stirring, until soft, 5-10 minutes. Pour in the ½ cup wine or broth and reduce heat to a simmer, cooking/stirring 2—3 minutes or until liquid is reduced by half.