It’s made in Holland and named after a London landmark, so of course HP Sauce is the Brummiest thing going. It’s “the best known brown sauce in the United Kingdom” and slavered across sausages the length of the land, despite “brown sauce” sounding more like a euphemism for, well, shit.
If that’s not enough of a sauce based double-entendre for you, HP Sauce became known as “Wilson’s gravy” in the 1960s and 1970s after Harold Wilson’s wife revealed he “covered everything” with it. Lucky old Mrs Wilson.
What gives it it’s unique taste is tamarind, and when the Midlands Vinegar Company launched the sauce back at the turn of the last century it was in Aston. The vinegar was made on one side of the A38 and piped over the road—you couldn’t get much more Brummie unless the tamarind pods were trod by Rustie Lee.
And then Heinz bought it and buggered off to the Netherlands, which to be fair sounds like a place brown sauce comes out of.