Best bolognese sauce

Name: Best bolognese sauce
Prep time: 20 min
Cook time: 3 h
Total time: 3 h 20 min
Cuisine: Italian
Ingredients: 2 tbsp olive oil; 250g ground beef; 250g ground pork; 110g pancetta, chopped into small pieces; 1 brown onion, finely diced; 1 carrot, finely diced; 1 stalk celery, finely diced; 4 garlic cloves, finely chopped; 1 tbsp fresh rosemary, finely chopped (about 2 big sprigs); 1 tbsp fresh sage, finely chopped; 1/3 cup tomato paste; 1 1/2 cups white wine, I used a sauvignon blanc; 2 cups chicken stock; 1 cup whole milk; Salt and pepper; 1 tbsp fresh lemon juice; 1/4 cup cream (optional); Lemon zest to serve (optional)