Rooibos leaves, which are grown in South Africa, resemble tea leaves but come from a different plant and don't have any tannins. They have recently made an appearance on store shelves here. You can substitute black tea in this recipe; add it during the last 5 minutes of simmering.
- Combine all of the ingredients in a large saucepan and bring to a boil over moderate heat. Reduce the heat to moderately low and simmer, stirring occasionally, until pale rust colored, about 20 minutes.
- Strain the chai through a fine sieve and serve hot.