Tasty vegan lasagne

Name: Tasty vegan lasagne
Cook time: 3 h
Total time: 3 h
Cuisine: Italian
Ingredients: 2 red onions; 2 cloves of garlic; 2 carrots; 2 sticks of celery; 2 sprigs of fresh rosemary; olive oil; 1 teaspoon dried chilli flakes; 100ml vegan Chianti wine; 1 x 400g tin of green lentils; 2 x 400g tins of quality plum tomatoes; 1kg mixed wild mushrooms; 4 heaped tablespoons plain flour; 800ml almond milk; 70g vegan Cheddar cheese; 300g dried lasagne sheets; ½ a bunch of fresh sage (15g)