Five-Spice Orange Beef

This was my first time making this dish and oooh am I glad I did--very tasty!  And it's a Cooking Light recipe, so not terribly indulgent (except that I made double the sauce...).  I made some modifications to the original recipe, which can be found here:
http://www.myrecipes.com/recipe/spice-orange-beef-broccoli
(yeah, I don't like broccoli, it's true, so I left it out)

Although I doubled the sauce when I made it this time, it was far more than enough, so I am posting the amounts for a single/regular recipe below (as that is what I will do next time).  It's also quite spicy, so if you are not up for that, cut back the red pepper flakes as you see fit :)

Ingredients:

1 lb. flank steak
3/4 tsp. Chinese five-spice powder
3/4 tsp. coarse ground black pepper
1/4 tsp. kosher salt
2 T. peanut oil, divided
1 1/2 c. vertically sliced onion
8 strips of orange rind (I cut a medium orange into 8 slices and then just removed the insides from each piece)
2 tsp. minced bottled garlic
1/2 c. beef stock
3 T. orange juice
3 T. hoisin sauce
1 T. low sodium soy sauce
2 tsp. rice vinegar
1 tsp. cornstarch
3/4 tsp. crushed red pepper
toasted sesame seeds, to garnish

Instructions:

1. Sprinkle five-spice powder, pepper, and salt over both sides of flank steak.

2. Heat a large skillet or wok over medium-high heat.  Add 1 T. of the peanut oil and swirl to coat.  Add steak.  Cook 4 minutes on each side and then remove to let rest 5 minutes.

3. After meat rests for 5 minutes, cut into to bite size 1/4" thick strips across the grain.

4. Meanwhile, combine beef stock and next 6 ingredients (through red pepper) in a small bowl; whisk together.

5. Return pan to medium-high heat.  Add remaining 1 T. of peanut oil and add onion, orange rind, and garlic.  Stir fry for 3 minutes.

6. Add stock mixture to pan and cook for 1 minute, then remove onions and orange rind with slotted spoon.  Cook for 1 more minute or until sauce is thickened and bubbly.

7. Add meat and accumulated juices back into pan and stir to coat.  Cook 1-2 more minutes.

8. Serve garnished with toasted sesame seeds (to taste) with rice or favorite side.  Enjoy!