Place a skillet over medium heat on the stove top or grill, add the rice and cook until golden brown, stirring frequently.
Using a mortar and pestle, grind the toasted rice into a fine powder.
To the powdered rice add fish sauce, tamarind paste, freshly squeezed lime juice, crushed red pepper flakes, sliced shallot and fresh cilantro. Adjust the pepper flakes to your liking.
Add brown sugar and mix the sauce ingredients together. Set aside.
Drizzle some olive oil over the steak and season with steak seasoning.
Preheat the grill to 450 degrees and set for direct heat.
Place the seasoned steak directly on the grates for direct heat cooking. Flip the steak every 2 minutes for a total of 10-15 minute cook time.
Remove the flat iron steak off the grill once it hits an internal temperature of 120-125 degrees and rest for 10 minutes.
Slice the steak across the grain and serve with the crying tiger sauce for dipping.
Notes
Any cut of beef will work with this sauce. You can even use it with chicken and pork!
If you want to make it less spicy, use HALF of the crushed red peppers.