I´ve looked up the "original" recipe on several sites.
Some say apricot halves, some say apricot jam.
Basically, it´s cooked chicken with a curried mayonnaise & cream sauce. Some of the recipes I looked at said the chicken was cooked in red wine, tomato purée, onions, etc. - but basically it´s a chicken salad with curried mayonnaise.
Later (ie. post - 1953) people started doing their own thing, just like they did with fettucine Alfredo. Added mango chutney, spicy pickles, sultanas, dried prunes, dates, etc.