Indian winter soup

INGREDIENTS

• 100g pearl barley
• 2 tbsp vegetable oil
• ½ tsp brown mustard seeds
• 1 tsp cumin seeds
• 2 green chillies , deseeded and finely chopped
• 1 bay leaf
• 2 cloves
• 1 small cinnamon stick
• ½ tsp ground turmeric
• 1 large onion , chopped
• 2 garlic cloves , finely chopped
• 1 parsnip , cut into chunks
• 200g butternut squash , cut into chunks
• 200g sweet potatoes , cut into chunks
• 1 tsp paprika
• 1 tsp ground coriander
• 225g red lentils
• 2 tomatoes , chopped
• small bunch coriander , chopped
• 1 tsp grated ginger
• 1 tsp lemon juice