Simple Bolognese

INGREDIENTS

• 1/4 cup extra-virgin olive oil
• 1 medium onion, coarsely chopped
• 2 garlic cloves , peeled and coarsely chopped
• 1 celery stalk, coarsely chopped
• 1 carrot, coarsely chopped
• 1 pound ground chuck beef
• 1 (28-ounce) can crushed tomatoes
• 1/4 cup flat-leaf Italian parsley , chiffonade
• 8 fresh basil leaves, chiffonade
• Salt and freshly ground black pepper
• 1/4 cup freshly grated Pecorino Romano