Triple cheese & aubergine lasagne - Good Food Middle East

Ingredients

• 12-16 fresh lasagne sheets
• 4 tbsp olive oil
• 3 large aubergines, cut into small chunks
• 2 large onions, chopped
• 4 garlic cloves, finely chopped
• 2 x 400g cans chopped tomatoes
• 2 tbsp tomato purée
• 1 tsp golden caster sugar
• pinch of chilli flakes
• small handful basil leaves, finely chopped
• dash of soy sauce
• 500g ricotta
• 50g Parmesan (or vegetarian alternative) finely grated
• 2 medium eggs, beaten
• ¼ tsp grated nutmeg
• 500g milk
• 50g plain flour
• 50g butter
• 100g mature cheddar, grated
• 1 tsp English mustard