Real Deal Pancetta and Pork Ragú

olive oil

pancetta, cut into a small dice

yellow onions, finely chopped

garlic cloves, finely chopped

Kosher salt and freshly ground black pepper

carrots, finely chopped

celery sticks, finely chopped

bay leaf

ground pork

tomato paste

dry red wine

tomato puree

diced tomatoes, with juice

whole milk

unsalted butter

sugar

bunch basil, leaves picked, plus more for garnish

Parmigiano-Reggiano cheese, grated