Braised lamb lasagne

Ingredients

• 1 tablespoon olive oil
• 2 kilograms lamb shoulder
• 1 onion, chopped
• 2 garlic cloves, finely chopped
• 2 tablespoons tomato paste
• 2 400 g cans diced tomatoes
• 2 cups water
• 1 cup red wine
• 1/4 cup basil, chopped, plus extra leaves to serve
• 2 teaspoons brown sugar
• 500 grams instant lasagne sheets
• Ricotta sauce
• 500 grams ricotta
• 300 grams light sour cream
• 3 eggs, beaten
• 3/4 cup mozzarella. grated, plus 1/4 cup extra
• 3/4 cup parmesan, grated plus 1/4 cup extra