Polpette alla cacciatora

Ingredients

• 500 grams (a little more than 1 lb) ground beef (see notes)
• 40 grams (1.5 ounces, about 7 tablespoons) freshly grated Parmesan
• 3 eggs
• 1 clove garlic, finely chopped
• Salt and pepper to taste (see notes)
• 50 grams (1/4 cup) low-fat or whole milk
• 2 tablespoons chopped fresh parsley
• 100 grams (1 cup) dried breadcrumbs
• Olive oil
• 1 small yellow onion, peeled and chopped
• 1 carrot, peeled and chopped
• 1 stick celery, peeled and chopped
• 500 grams (2 cups) crushed tomatoes (passata if you're in Italy)
• 1 sprig rosemary
• 120 mL (1/2 cup) red wine
• 90 grams (1/2 cup) black olives