Lamb dhansak (parsi cuisine)

Ingredients

• 100 g red lentils
• 500 g butternut squash , peeled and chopped into chunks
• 2 onions roughly chopped
• 400 g tin chopped tomatoes
• 1 teaspoon turmeric
• 1½ teaspoon cumin seeds
• 1½ teaspoon coriander seeds
• 4 cardamom pods , squashed
• Oil
• Water for cooking
• 400 g lean diced lamb
• Thumb-sized piece root ginger , finely chopped
• 4 garlic cloves , crushed
• 2-3 green chillies , sliced
• 1 teaspoon garam masala powder
• Small bunch coriander , chopped
• Chapatti or steamed basmati rice to serve