Soak the saffron in a bowl with 3 tablespoons of warm mater (in addition to the one mentioned in the ingredients list). This will allow it to fully release its flavor and color.
Melt the butter in a heavy bottomed pan over medium heat. As soon as it is warm, add the chopped onions and a pinch of salt.
Sautee the onions, mixing frequently, and cook them until they become soft and translucent.
Next, increase the heat to high and add the raw rice. Mix well, and toast it until it changes color and its edges become translucent too. This process will take a another 3-5 minutes.
Now, add the room temperature water and the saffron water. Mix well once more.
Immediately, cover the pan with a tight fitting lid and bring to a boil. As soon as the it boils, reduce the heat to low. If necessary, move the pan to the small hob, as you want the cooking liquid to gently simmer, not boil. Cook the rice for 10 minutes.
Once done, switch the heat off, and allow the rice to rest while still covered for a further 10 minutes. Do not remove the lid or mix the rice just yet!
After resting, fluff your rice with a fork.
Your saffron rice pilaf is now ready to be served - enjoy!