Mix together the oil with the dried mint, chilli powder, onion granules, ajwain seeds and coarse sea salt to form a paste.
Add the paste to the lamb chops and set aside to marinate for around an hour; the marinade time is optional, but it does improve the final dish.
Pour the water over the tamarind, mash it with a fork and allow it to soften for 10 minutes.
Peel the onion, roughly chop it and place it in a mini blender.
Peel the garlic cloves and add them to the blender.
Peel the ginger, roughly chop it and add it to the blender.
Discard the stems from the green chillies and cut them in half lengthways.
Heat the ghee in a 28-30cm (11-12") frying pan over a medium-high heat. When the ghee is hot, add the fennel seeds, curry leaves, cinnamon stick, and green chillies, then cook for 60 seconds.
Stir through the cumin, turmeric, and amchoor.
Add the blended onion mix and cook for 5 minutes.
Add the tinned tomatoes, honey, vinegar, and fenugreek leaves, stir, then reduce the heat to low.
Mash the tamarind again and pass it through a fine-mesh sieve before adding to the sauce.
Have a taste of the sauce, add salt as desired, cover with a lid and simmer for 10 minutes.
I like to discard the cinnamon at this point, blend the sauce and pass it through a fine sieve; this is an optional step.
Whilst the sauce is simmering, heat a griddle pan over a high heat. When the pan is hot, stand the lamb chops on the fat/skin side and cook for 1-2 minutes; you may need to use some cooking tongs to hold them up.
Flip the chops onto the side and cook for another minute before flipping and cooking for another minute.
Add the garam masala to the sauce along with any remaining marinade and mix. Now is a good time to check for salt again.
Drop in the lamb chops and cover them with the sauce, and then cook for a final 5-10 minutes (depending on how thoroughly you want the chops cooked).