For completion; yesterday in the post "Return of the Raj" the question was posed "Anyone for mutton curry" and here is the answer.
The recipe above derives from the 1830's and an officer in the 39th Madras Native Infantry.
The persons named in that post from that time may well have enjoyed the dish in that the officer commanding the 39th was the brother of one of them.
You will need proper and younger mutton at least, and hogget would do well. Lamb is not sufficiently robust.