Spicy Flank Steak Stir Fry

Learn how to cook spicy & tender flank steak stir fry with our easy & simple recipe. The blend of fiery red pepper flakes and Rumi Spice’s black cumin & coriander create a unique flavor that you will enjoy at home.

Difficulty: Easy
Servings: 2-4 servings
Prep Time: 25 minutes
Cook Time: 20 minutes


  • 1 lb flank steak
  • 5 garlic cloves, thinly sliced
  • 4 green onion, sliced into 1 inch pieces
  • ½ white onion, sliced and chopped
  • 2 tsp tapioca flour
  • 1 ½ Tbsp vegetable oil
  • 1 ½ tsp sesame oil
  • 1 Tbsp soy sauce
  • 1 Tbsp rice vinegar
  • ½ tsp salt
  • 1 ½ tsp black pepper
  • ½ tsp red pepper flakes
  • 1 tsp black pepper
  • 1 tsp Rumi Spice Herati Coriander, coarsely ground
  • 1 ½ tsp Rumi Spice Wild Black Cumin, ground
  • Serve with brown or white rice


  1. Using a mortar & pestle or spice grinder, coarse grind the whole coriander & finely grind if using whole cumin.
  2. Tenderize the flank steak with a mallet on a cutting board until it is ½ inch thick. Then slice the beef into 2-inch pieces.
  3. Place the steak pieces in a bowl and add sesame oil, soy sauce, salt, black pepper, and tapioca flour. Mix well and let sit at room temperature for 20 minutes. 
  4. Heat a large wok or skillet over medium heat and add 1 Tbsp of vegetable oil.
  5. Working in batches, sear the steak pieces on the wok until each piece is browned on both sides. Set beef aside. 
  6. Add additional vegetable oil (if needed) to the wok—mix in onions, red pepper flakes, cracked coriander, & ground cumin. Sauté until onions are softened. 
  7. Add garlic, rice vinegar, and green onions and cook for about 2-3 minutes.
  8. Stir in beef and cook until it heats through. 
  9. Serve with white or brown rice.


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