Place your 400 grams of cooked, cooled rice in a large bowl. Gently run your fingers through it to break up any clumps. Set aside.
Heat 2 tablespoons of gingelly oil in a wide pan or wok over medium heat. Add 1 teaspoon of mustard seeds and wait until they crackle and pop enthusiastically.
Add 3 tablespoons of raw peanuts, 1 tablespoon of chana dal, and 1 teaspoon of urad dal. Stir-fry constantly on medium heat for about 2 minutes until they turn pale golden-brown and release a nutty aroma.
Drop in the slit green chilies, curry leaves, and 1/4 teaspoon of hing. Let them sizzle for 10-15 seconds until the curry leaves turn crisp.
Turn the heat down to low. Stir in 1/2 teaspoon of turmeric powder and your desired amount of salt, mixing it into the oil for just 5 seconds to bloom the color.
Add the pre-cooked rice to the pan. Using a rubber spatula or wide wooden spoon, gently fold the rice into the tempered oil from the bottom up. Do not press or mash the grains. Heat through for 2 minutes.
Turn off the heat completely. Pour the fresh lemon juice over the yellow rice and give it one final, gentle fold to combine. Serve warm or at room temperature.