In a large pot, heat the olive oil. Add the chopped onion and saffron threads and cook over moderate heat, stirring occasionally, until the onion is softened, 7 minutes.
As I've mentioned before, my inclination is always to slightly under salt and then allow each individual to season her meal to her liking. Ruining an entire batch of soup by adding too much salt is pretty upsetting!
This dish is protein light, so in the initial Tear Down phase, eat some protein as well - perhaps a couple hard boiled eggs or a grilled chicken breast.