Why is my skirt steak tough and chewy?

Online Answer
Skirt steak is shaped much the same, but tends to have a beefier flavor. But, this cut comes from the diaphragm muscles of the animal, making it a tougher piece of meat. It can become very chewy quickly, especially if it's not cooked correctly. ... They love marinade and high-heat, quick cooking..
Related Questions 📌
Also called flap steak, the unflatteringly named cut is similar to skirt and flank in that it comes from the less tender regions of the animal. Often cheaper than more popular cuts, this little underdog of the beef world has a wonderful meaty flavor and fine texture when prepared carefully.
Optimally, for tough steaks like skirt and flank, it's best to marinate it no longer than 24 hours in the refrigerator. Beyond overnight marinating is overkill. Also, never re-use a marinade.
Skirt steak is cheaper per pound than flank steak. Both are relatively cheap cuts and a good deal most of the time, but if you're really pinching pennies then you can get more meat with your dollar going with skirt.
Skirt steak is a cut of beef steak from the plate. It is long, flat, and prized for its flavor rather than tenderness....Skirt steak.Beef cutsAlternative namesRomanian tenderloin.
The flat iron is very similar to any of the flat steaks, so any recipe calling for skirt or flank steak will be the perfect opportunity to try the flat iron steak. This cut is best grilled over medium-high heat.