Coronation Sauce is a dead product.
It was a light-coloured creamy sauce with a mild curry flavour and a fruity taste.
Made by the Heinz Company (its full name was “Heinz Coronation Sauce”) and sold in 10.6 oz (315ml) bottles, it was meant as a shortcut way to make Coronation Chicken — you just poured some on cold chopped chicken, and tossed. It was a good way to use up leftover chicken or turkey easily.
The product was discontinued sometime in 2004, perhaps owing to lack of demand. Ready-mixed Coronation Chicken Sandwich Filler (with the sauce and the chicken already mixed together) overtook it in popularity and people no longer used the sauce to make up their own — from scratch, as it were.