Think of a pork roast as a bundle of long, thin muscle fibers. They run in a very specific direction, like the grain of wood.
If you slice against those fibers, you’re cutting those tiny ropes short. This makes each bite tender and easy to chew.
Slice with the grain, and you’re basically serving long, tough strings. It’s like trying to eat a shoelace—not cool.
Where Is That “Grain” Anyway?
Look at your roast. See those lines running along the surface? That’s the grain.
For a pork loin (that long, lean cylinder), the grain usually runs from one end to the other. For a pork shoulder, it’s a wild, unpredictable mess of lines.
When in doubt, look for the direction the meat naturally pulls apart. That’s your enemy line—and you want to cut across it.