"WHAT IS MUTTON ?
Over the past 40 years, mutton has virtually disappeared from our shops and menus. Yet, for many hundreds of years mutton was the only form of sheep meat eaten in these islands - lamb being considered too immature. There is no strict definition of mutton - at one time it was simply any sheep meat sold after Christmas, but generally it refers to older sheep meat. At Graig Farm we define it as any animal over 2 years old. There were grades of excellence of mutton, from the rather inferior and fatty lowland English breeds, which also tended to be relatively tasteless (although the exception to this was the Southdown); through the famous Salt Marsh mutton, which grazed the salt grasses of the South Eastern coast of England, with its characteristic flavour; to the incomparable Welsh Mountain mutton."
I have enjoyed mutton at my favorite Sri Lankan restaurant in Toronto, Rashnaa.