4 ounces pancetta (or center cut bacon chopped) 1 tablespoon unsalted butter 1 large white onion (minced) 2 celery stalks (about 3/4 cup, minced) 2 carrots (about 3/4 cup, minced) 2 lb lean ground beef 1/4 cup dry white wine (such as pinot grigio) 2 28 oz cans crushed tomatoes (i love tuttoross