Spinach and Lamb curry (Saag Gosht)

Ingredients

• 900 g lamb (on and off the bone)
• 500 g spinach leaves
• 3 medium onions, chopped
• 2 tbsp vegetable ghee or 4 tbsp sunflower oil
• 1 tbsp fresh ginger paste
• 1 tbsp fresh garlic paste
• 1 tsp cumin (zeera)
• 1 tsp coriander powder
• 1 tsp red chilli powder or to taste
• ½ tsp salt or to taste
• 1 tsp garam masala
• ½ tsp tumeric powder
• 2 medium tomatoes, chopped
• 2 green chillies (slit for flavour)
• 2 tbsp chopped fresh coriander leaves