(, Sun 28 May 2023, 16:23, archived)
If the authenticity of a recipe comes from the ethnicity of the parents of the supplier of the recipe...
and given that I am willing to bet that your mate had only one Jamaican parent, otherwise why mention just the dad...
then, by my calculations, this endows your recipe with exactly 50% authenticity.
(, Sun 28 May 2023, 22:29, archived)