Indian winter soup

Name: 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 potato, 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