Form the tahdig: Mix the cooled rice, onions, and garlic. Heat a deep 8-inch cast-iron skillet or non-stick pan over low heat for a few minutes. Add the oil, swirl to coat the pan. Spread the rice mixture evenly over the bottom of the pan, and pack it down tightly with an offset spatula or large wooden spoon. Sprinkle the sea salt over the rice.
Cook the tahdig: Cover and turn the heat up to medium-high. Cook the rice for 10 minutes, then turn down the heat to very low and place a clean dish towel under the lid to catch condensation, and cover the pan tightly. Don't let the towel near the burner. I used a rubber band to contain the four corners of the towel on top of the lid. If you have a heat difuser, put it between the burner and the bottom of the skillet to disperse the cooking heat. Cook for 50 minutes.
Serve tahdig: Carefully lift the lid from the pan. There will be condensation trapped under the lid, so avoid tilting it over the rice. Loosen the sides of the tahdig with a spatula and flip it onto a plate. Garnish with parsley and/or tomato onion jam.
Notes
The cooking time is totally dependent on your stove's calibration. I've under- and over-cooked this recipe during testing. My advice is to start checking it 10 minutes before you think it's supposed to be done. Take a spatula and gently lift up a side to check the browning. When you're satisfied, it's done!
Recipe by Creating Silver Linings at https://www.creatingsilverlinings.com/tahdig-persian-hash-browns/