Vegetarian lasagne

Name: Vegetarian lasagne
Prep time: 50 min
Cook time: 40 min
Total time: 1 h 30 min
Cuisine: Italian
Ingredients: 3 tbsp olive oil; 1 clove garlic, minced; 2 tsp minced ginger; 1 medium carrot, peeled and diced; 1 large onion, diced; 1 aubergine, finely diced & salted for 15 mins; 1 small green pepper, chopped; 1 small red pepper, chopped; 1 punnet mushrooms, cleaned and finely sliced; 1 (400g) tin of chopped tomatoes; 2 tbsp tomato puree; 1 tbsp fresh oregano; 1 tbsp fresh rosemary; 300ml vegetable stock; Salt or herb seasoning; 150g fresh spinach leaves, washed and chopped; 3 tbsp butter; 3 tbsp plain flour; 700ml milk; 100g (3 1/2 oz) grated mature Cheddar cheese; Salt or herb seasoning; One box of lasagne sheets; Finely grated Parmesan or Pecorino cheese