Add a small pinch of saffron (about 20 long threads) in a small teapot for 2. If using ginger, now's the time to drop a couple of slices in. The size won't matter.
When the water has boiled, count to ten, then pour it over the saffron. We let the water cool ever so slightly to ensure that we don't lose all the essential oil off the saffron, with the steam. Steep for 5 minutes.
Strain, and sweeten as desired. If adding lemon slices, now's the time to drop them in.
If you like, you can get another round of tea with the used threads. It won't be as strong as the first cup, but will still be delicious. Just repeat the process with freshly boiled water.