If your lamb chops are quite thick, use a meat mallet and bash them meat a bit until it is of an even thickness. This will help them to cook faster.
Put the lamb chops into a large bowl with the lemon juice, salt, and red chilli powder. Stir well and leave to marinade for at least 15 minutes.
To the lamb chops, add the rest of the ingredients and mix really well. Leave to marinade for a few hours or overnight.
Place a large pan over medium high heat. When it's hot, put in the lamb chops along with all its marinade. Let it bubble then cover with a lid and let it cook on the lowest heat for 1 hour, stirring halfway. Check the meat to see if it's soft. If it isn't, cook it further until it is. When the lamb is soft, turn the heat up and allow the masala sauce to thicken up until you're happy with it. At this point, you can pan-fry or grill the lamb chops to get them crispy if you prefer.
Put the lamb chops onto a platter to serve and sprinkle over chopped coriander and green chillies to garnish. Serve with chips and your favourite salad.