Am I missing something or is this really the bare minimum of a joke? Is the only “comedy” here that tan is also in the word tangerine? You could rearrange this and have cos lettuce instead, right?
They were once marketed as being from Tangier, a city in Morocco where a few are grown. They've more recently been called Mandarins, because they're in fact native to China.
![sin(gerine) over cos(gerine) = [photo of a tangerine]](https://media.kbin.social/media/13/80/1380fb65fa45c5f966a6d0a71cc4e73e9bf6b2c2a2e2c234b8d0ff864b52bb41.jpg)
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