Why did the marinade write a memoir?

This joke gets its flavor from a clever bit of wordplay, a classic humor mechanism that plays on words with double meanings. The key phrase here is "let things soak in." When we talk about a marinade, "soaking in" is literally what it does, infusing meats or vegetables with deliciousness over time. It’s all about absorption and making sure every bit of flavor is deeply integrated.

But when a person wants to "let things soak in," it usually means they're taking time to reflect, to fully absorb information or experiences, or to ponder the deeper meaning of something. It's a mental and emotional process of contemplation, much like one might do when writing a memoir, which is a personal account of one's life. The humor comes from applying this very human, reflective process to an inanimate culinary concoction, creating a delightful and unexpected twist.