Vegetarian kumara and sundried tomato lasagne

Ingredients

• 650 grams kumara, cut into 1cm slices
• 2 tablespoons olive oil
• 1 onion, chopped
• 3 fat cloves garlic, crushed
• 1/4 cup sundried tomatoes, chopped
• 1 capsicum, deseeded, chopped
• 750 millilitres passata
• 1/2 cup water
• 1/4 cup tomato paste
• pinch of sugar
• 150 grams frozen spinach
• handful of basil leaves
• 1/2 teaspoon oregano
• salt and pepper
• 400 grams pack dried lasagne sheets
• 1/4 cup cheddar cheese
• Béchamel sauce
• 2 tablespoons plain flour
• 600 millilitres milk
• 3/4 cup grated cheddar cheese
• 1/4 cup parmesan cheese