Ingredients:
Tomato sauce:
* 2 tbsp olive oil
* 1 onion, peeled and chopped
* 1 kg (2 lb 4 oz) plum tomatoes, skinned, de-seeded and chopped
* 1 clove garlic, crushed
* 75 ml (2 1/2 fl oz) vegetable stock
* 2 tbsp tomato puree (paste)
* 1 tsp caster sugar
* 1 bay leaf
* 1 tsp balsamic vinegar
* 1 bunch basil leaves, roughly torn
* salt and freshly ground black pepper
Cheese sauce:
* 200 ml (7 fl oz) creme fraiche
* 6 tbsp freshly grated Parmesan cheese
* 125 g (4 1/2 oz) mozzarella cheese, diced
* 75 g (3 oz) Cheddar cheese, grated
* 2 tbsp cornflour mixed with 2 tbsp water
* salt and freshly ground black pepper
* 9 sheets no pre-cook lasagne