It's not only a valid filling, it's mentioned in Half Man Half Biscuit's classic "Twenty Four Hour Garage People." So it's in the collective consciousness as a filling that's available at filling stations. You can't get much more validity than that.
(given that this is part of a "settle an arguement" between you and your good lady wife, I am given to smirk about the idea of exposing a New Yorker to HMHB and expecting her to have the faintest clue about it all.)
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(given that this is part of a "settle an arguement" between you and your good lady wife, I am given to smirk about the idea of exposing a New Yorker to HMHB and expecting her to have the faintest clue about it all.)