I’m not sure many people associate McVitee's Jamaica Ginger Cake with calculus but I am one of them.

Anyhoo, sometimes the biscuit tin wasn’t called for because there was cake. Specifically, Jamaica Ginger Cake (I never recall any other type of cake being on offer). Definitely a bonus day.
I can’t say it’s the most gingery thing on the planet. In fact, were it not for the label, one might have difficulty identifying the flavour, beyond something vaguely warm and spicy. I mean, we’re not even talking about the still-fairly-tame-but-at-least noticeable levels of ginger in gingernut biscuits. But no matter. It is sticky, claggy, warming and friendly. And makes 3D vectors marginally easier to deal with. Happy days.