Instructions

  1. In a large bowl, whisk together soy sauce, rice vinegar, lime juice, sesame oil and fish sauce.
  2. Stir in onion, basil, mint, lemongrass, serrano pepper and crushed peanuts. Season with chili sauce, coriander and garlic salt; stir to combine.
  3. Place flank steak and marinade in an airtight container for 6 hours or overnight.
  4. Preheat grill to medium-high heat and lightly oil the grate.
  5. Drain liquid from marinated steak, reserving the steak and non-liquid ingredients.
  6. Spray a large sheet of aluminum foil with cooking spray; place flank steak and non-liquid marinade ingredients on top and fold to seal.
  7. Grill for 20 minutes or until beef reaches desired doneness.