Drain the soaked rice thoroughly through a sieve. Add the drained rice to the pan with the vermicelli and stir everything together. Pour in the hot chicken stock, sprinkle in ½ teaspoon of salt, and stir well before returning the pan to the hob over high heat.
Bring the liquid to a rolling boil, then immediately reduce the heat to the lowest setting, cover the pan with its lid, and let it simmer for 7 to 9 minutes. The rice should have absorbed most of the liquid.
Remove the pan from the heat, keeping the lid on. For the best fluffy texture, cover the lid with a couple of sheets of kitchen paper or a light tea towel, then place the lid back on top. Let the rice sit undisturbed for another 10 minutes. Finally, fluff it up with a fork before serving.