- 2 teaspoons seeds from green cardamom pods
- 1/2 teaspoon seeds from black cardamom pods
- 1 (3- by 1-inch) piece fresh ginger, thinly sliced
- 3 cups water
- 2/3 cup sugar
- 1 tablespoon brewed Ethiopian spice tea
- 1/2 cup fresh lemon juice
- Toast cardamom seeds and ginger in a dry 3-quart heavy saucepan over moderately low heat, stirring constantly, until very fragrant, about 2 minutes. Add remaining ingredients and simmer, stirring occasionally, 10 minutes. Remove from heat and cool to room temperature. Pour through a fine sieve lines with a paper towel into a bowl.
- Pour into an 8- to 9-inch metal baking pan. Freeze, stirring and crushing lumps with a fork every 30 minutes, until firm.
- Scrape granita with a fork to lighten texture and serve in cordial glasses.