Uncover the pot, spread the rice over the carrots in an even layer, and sprinkle with 1 tablespoon salt. If necessary, add more boiling water to cover the rice by about ¼ inch. Adjust the heat to maintain a lively simmer and cook the plov until the water has started to evaporate, about 5 minutes. Using a spatula, push the rice into the center of the pot to form a mound. Use the handle of a spatula or large spoon to make 6 deep holes in the rice mixture. Place a shallow heatproof bowl or plate over the plov; alternatively, cut a circle of parchment paper to fit and place it over the plov. Drape a clean dish towel over the pot and cover with the lid, tying up the loose ends of the towel so they don't hang over the burner.