Pan Fried Steaks with Balsamic Glaze

I found this recipe on Internet. I used chopped red onions since I did not have shallots on hand. I love using balsamic vinegar and the glaze is really tasty.

• Ready In: 20 mins
• Serves: 4

Ingredients

• 4  filet of beef, about 1 1/2 inch thick (or small steaks of your choice)
•  coarse salt (Kosher)
• 1⁄4 cup red onion, finely chopped
• 1⁄2 cup  balsamic vinegar
•  fresh coarse ground black pepper
• 3  tablespoons butter

Directions

1. Put coarse (Kosher) salt in iron skillet.
2. Heat skillet over high heat.
3. When salt begins to sizzle or jump, place steaks in pan.
4. Sear until crusty for about 3 minutes.
5. Turn steaks over and sear again for about 3-4 minutes (for rare).
6. Add another minute or two to desired doneness.
7. Remove steaks to platter; keep warm.
8. Add chopped onion to pan; stir for about 30 seconds.
9. Add balsamic vinegar; boil until reduced to about 2 tablespoons.
10. Add 3 Tbsps butter; swirl to melt.
11. Add black pepper.
12. Pour glaze over warm steaks and serve immediately.