A steak that bounces around and even picks fights with the diners. "Only true warriors eat the Invincible Steak" was arguably the most successful marketing campaign of the Amber Era. In reality, however, the Invincible Steak isn't alive at all. It's not even meat. It's just a synthetic food made from fungal matter. "This veggie steak has more muscle than I do. How is that even possible?" "Obviously, all you need is an electrical signal and it immediately starts doing sit-ups. Can you do that?"