1.Finely chop one of the chillies, finely shred remaining chilli.
2.Heat half the ghee in 6-litre (24-cup) pressure cooker, cook lamb, in batches, until browned. Remove from cooker.
3.Heat remaining ghee in same cooker, cook onion, stirring, about 5 minutes or until browned lightly. Add garlic and ginger, cook, stirring, until fragrant. Return lamb to cooker with spices, tomato, chopped chilli, yogurt and the water, secure lid. Bring cooker to high pressure. Reduce heat to stabilise pressure, cook 25 minutes.
4.Release pressure using the quick release method, remove lid. Stir in juice, season to taste. Serve sprinkled with coriander and shredded chilli, if you like.
If you have an electric pressure cooker you won’t need to reduce the heat to stabilise pressure, your cooker will automatically stabilise itself. Always check with the manufacturer’s instructions before using. This is a hot curry. If you prefer a milder version, reduce the amount of pepper and chilli. You can also serve it with an extra dollop of yogurt if you like.