Skirt steak is packed with flavor and is a great alternative to more expensive cuts. You’ll love it in steak tacos or served on its own with this delicious herb sauce. The most important thing about preparing skirt steak is to slice it against the grain. The grain in the skirt steak is obvious — it looks like big lines running across the meat. Cut the slices perpendicular to those lines and you’re left with very tender, flavorful meat.
Source: Real Family Food