In a large bowl, mix together marinade ingredients as listed above until combined. Add steaks to marinade and coat evenly. Marinate for 15 minutes at room temperature.
In a small bowl, add tamarind pulp and hot boiling water. Dissolve the pulp with a fork. Once it's cool, use clean hands to dissolve the pulp around the seeds. Run the paste through a fine sieve to remove any pulp or seeds. This is tamarind paste. Set aside.
In an oil-less pan on medium heat, toast rice until brown, about 3-4 minutes.
Transfer toasted rice into a mortar and pestle, spice grinder or a high power blender. Grind the rice until it becomes toasted rice powder.
In a small bowl, combine tamarind paste, rice powder and remaining dipping sauce ingredients as listed.
Heat vegetable oil in a heavy bottom frying pan or cast iron skillet on medium-high heat. Sear steaks on each side for 3-4 minutes for rare steak to medium rare with internal temperature of 131-139 F with a digital thermometer. For medium well, cook for another 1 minute on each side on medium-heat until an internal temperature of 150-158 F. For well done, cook for another 2-3 minutes on medium heat on each side until an internal temperature of 158 - 212 F.
Remove steaks from pan and let them rest on a cutting board for 10 minutes before slicing on a bias.
Serve steak and enjoy with dipping sauce!