Broccoli and courgette Lasagne

Ingredients 8 oz Broccoli cut in florets 2 courgettes cut in circles 480 ml/ 2 cups vegan mozzarella cheese, plus extra cheese to make the sauce and 2 tablespoons cornstarch/ cornflour to thicken the sauce 1 tsp dried basil, 1 tsp dried Italian herbs, 1 tsp dried oregano 700ml 5 cups tomato sauce Pack of