Originally Posted by
deniah
They all looked very rare, but actually very tender and easy to chew. The commonality being high quality Spanish cattle that is grass-fed, which you can tell by the yellow-colored fat (grain-fed tends to be white).
It's a little more involved than that. You can feed cows grass all their life and still end up with white fat. OTOH you can feed a cow grain all its life then finish it in fresh pasture to turn the fat yellow. Commercially, yellow tinted fat is undesirable and reduces sale yard prices so most farmers try and minimise it.