Creamy Vegetable and Sausage Lasagna

Ingredients

• Vegetable and Sausage Sauce

  • 1/2 lb (225 g) white mushrooms, halved
  • 1 onion, cut into 8 pieces
  • 1 celery stalk, cut into pieces
  • 1 carrot, cut into pieces
  • 2 garlic cloves, halved
  • 3/4 lb (340 g) mild Italian sausage meat
  • 3 tbsp (45 ml) olive oil
  • 1 can (28 oz/796 ml) diced plum tomatoes
  • 1/2 cup (125 ml) chicken broth or water
  • 1 tsp dried oregano
  • 1/4 tsp red chili flakes

• Béchamel

  • 1/3 cup (75 g) butter
  • 6 tbsp (60 g) unbleached all-purpose flour
  • 3 cups (750 ml) milk
  • ½ cup (35 g) Parmesan cheese, freshly grated

• Topping

  • 12 lasagna noodles, cooked until al dente
  • 2 cups (200 g) mozzarella cheese, grated