Spicy lentil soup with squash, tomato and green beans (sambar)

INGREDIENTS

• 100g/3½oz tur dal (yellow split pigeon peas
• 1 small onion
• 100g/3½oz carrots
• 100g/3½oz pumpkinbutternut squash
• 100g/3½oz green beans
• 1 medium tomato
• 1½ tsp ground turmeric
• 1½ tsp sugar
• 1½ tsp salt
• 50ml/2fl oz vegetable oil
• 1 tsp chana dal (Bengal gram or split yellow peas)
• 1 tsp fenugreek
• 1 tsp coriander seeds
• 4 dried Kashmiri chillies
• handful fresh curry leaves
• 1 tsp asafoetida
• 2 tbsp vegetable oil
• 1 tsp black mustard seeds
• 1½ tsp fenugreek