Beef Marinade (For Stir Fry or Kabobs)

Today's Joy: Something New & Delicious!
Got brave tonight, Reader, and decided to make my own marinade from scratch.  I seem to remember from watching Tyler Florence on Food Network that you need an oil and something acidic, like vinegar.  And I wanted an Asian flavor, seeing as I was stir-frying beef & veggies.  So I dug thru the spice cabinet and found several likley candidates for a tasty marinade.  I added a bit here and a dash there and voila!  The resulting stir fry was really good!  Low-calorie but lots of flavor!  Here it is if you'd like to try it:

Homemade Beef Marinade (For Stir Fry or Kabobs)
1/2 cup extra virgin olive oil
2 tbl. soy sauce
1 tbl. red wine vinegar
3 tsp. molasses
1 tsp. onion powder
1 tsp. ground cumin
1 tsp. ground ginger
1 tsp. chopped garlic
splash of grapefruit juice

Whisk all ingredients in a mixing bowl. 
Place 2 small sirloin steaks in a shallow pan. 
Brush 3/4 of marinade over both sides of steaks, cover and refrigerate.  Set remaining marinade aside. 
Marinate steaks for at least two hours. 
Chop your choice of vegetables. 
I used fresh broccoli, scallions, mushrooms and snap peas.  Set aside.
Once steaks are marinated, slice fajita-style and brown in hot skillet.
Just before steak reaches desired doneness, remove and set aside.
Add 1 tsp. olive oil to hot skillet, then add veggies.  Cook, stirring constantly until veggies are still crisp, but no longer raw.  Brush veggies with marinade and add steak.  Cook, stirring constantly until steak is done.  Serve immediately over white or brown rice.  Serve any remaining marinade on the side.
Serves 4.

*For kabobs: marinate raw meat & veggies for at least 2 hours, then skewer and brush with marinade before grilling or oven-roasting.*