That squiggly line running along the back of a shrimp is its digestive tract. Yes, you read that right: it’s basically the shrimp’s version of a tube that holds whatever it ate last—often plankton, sand, or microscopic ocean debris. Don’t panic: it’s not a vein full of blood, even though we call it “deveining.” Think of it as the shrimp’s tiny, unappealing pantry.
When you cook a shrimp without removing it, that pantry can become a gritty, slightly bitter surprise. Ever bitten into a perfectly grilled shrimp and felt a faint crunch that wasn’t the coating? Yeah, that’s likely the digestive tract saying hello.