Wonder if it could have been Nihari? A traditional Pakistani dish, never had it with chops though, usually just with 'random meat carnage' on the bone.
Was the sauce quite thin, very savoury, but very unlike a BIR, and with perhaps a touch of fennel/star anise flavour? If so it could be Nihari.
You can buy Shan's Nihari Masala from most good Pak/Indian grocers, well worth a go

Gary