The Turing test (originally called the imitation game by Alan Turing's 1950 paper) is a test of a machine's ability to exhibit intelligent behaviour equivalent to, or indistinguishable from, that of a human. Turing proposed that a human evaluator would judge natural language conversations between a human and a machine designed to generate human-like responses. The evaluator would be aware that one of the two partners in conversation is a machine, and all participants would be separated from one another. If the evaluator cannot reliably tell the machine from the human, the machine is said to have passed the test.
By a rough analogy, then, we might say that a product passes a 'Turing Test' for plant-based meat if an evaluator cannot reliably tell the difference between plant-based meat and actual meat products.