Optional hefty dose of tartrazine lends luminescent orange glow.
Various stories abound.
Said to have originated between 1950's and 1970's and birthplace is sometimes cited as a Glasgow curry house. Legend has it one obstinate diner demanded gravy on tandoori chicken. A bemused chef responded by adding tin of Campbell's tomato soup and pinch of spices, unwittingly partaking in early example of fusion cookery. A 1998 survey by Real Curry Restaurant Guide of 48 different CTMs found only common ingredient was chicken. Sainsbury's sell 1.6 million CTM meals every year and stocks 16 CTM related products including chicken tikka masala pasta sauce .