One-Dish Sweet Potato Lasagne

Name: One-Dish Sweet Potato Lasagne
Cuisine: European, Italian, Mediterranean
Ingredients: 3 aubergines; 2-3 large sweet potatoes; 2 red peppers; 1 x 400g / 14.1oz tin of cannellini beans; vegan parmesan, for topping; 3 garlic cloves; 2 thick sprigs of fresh rosemary; 800g / 28.2oz passata; 1 tbsp tomato puree; 2 tbsp balsamic vinegar; 1 tbsp dried oregano; 1/2 tsp salt; large pinch of pepper; For the tofu ricotta; 350g / 12.3oz silken tofu; 200g / 7oz vegan cream cheese; 1 tsp onion powder; pinch of salt; 3/4 tsp freshly ground nutmeg