Actually, it is naturally tender and is very close to the liver internally on the steer. That is where it derives it's natural deep color and flavor. In the past it has been referred to as the Butcher's Tenderloin. They generally kept them for themselves as they didn't appear very pretty and there is only one, per side, per steer. IMHO they are marinated because most people don't like their mild liver type flavor. Thanks for you input. Not a real popular cut, but I love them!
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