What is all that white suet when frying pork loin?

The white "suet" you see when frying pork loin is actually fat that has rendered out from the meat.

Here's a breakdown:

* Suet is a specific type of fat found around the kidneys and loins of beef and sheep. It's typically hard and white.

* Pork loin has a good amount of intramuscular fat (marbling), which renders out during cooking. This fat contributes to the flavor and juiciness of the meat.

Here's why you see that white fat:

* Heat: When you heat pork loin, the fat melts and starts to render out.

* Moisture: Some of the moisture in the meat also evaporates, leaving behind the rendered fat.

* Appearance: The rendered fat looks white and may appear as a separate layer, especially if you're frying the pork loin in a skillet.

Note: The amount of white fat you see depends on the cut of pork loin, the amount of marbling, and the cooking method.

Hope this helps!