Name: Hachis Parmentier
Prep time: 20 min
Cook time: 60 min
Total time: 80 min
Yield: 6
Ingredients: 1 small onion; 2 large carrots; 2 garlic cloves; 2 pounds potatoes (Yukon Gold preferred); 2 tablespoons olive oil; 2 1/2 tablespoons tomato paste; 1/2 teaspoon herbes de provence; 1 1/2 pounds lean ground beef; 1 egg yolk; 1/4 cup grated Parmesan cheese (divided); 1 tablespoon chopped parsley (plus more to garnish); 3 1/2 tablespoons salted butter; 4 ounces 2% milk; 3 tablespoons grated Gruyère cheese; Kosher salt; Freshly ground black pepper; Nutmeg clove (optional)