It's sweetened and clarified with the bitter twigs and leaves of a shrub called gesho, which also drives the fermentation instead of commercial yeast.
Tej is a home-brewed honey wine fermented with gesho (a hop-like local plant), giving it a sweet, slightly bitter, wine-like character that ranges from light to strongly alcoholic. It's served in rounded flask-shaped glasses called berele at tej houses and street-side stalls throughout Ethiopia.