Black Jack is a type of "aniseed flavour chew" according to its packaging.
It is a chewy confectionery manufactured under Valeo Confectionery's Barratt brand in UK and Spain.
Introduced in the 1920s by Trebor, the wrapper originally showed gollywogs on it.
[1] The recipe has varied over the years.
In 2021 the ingredients were: glucose syrup, sugar, palm oil, colour (vegetable carbon), hydrolysed pea protein, citric acid, aniseed oil, acidity regulator (trisodium citrate).