In our experience Abyssinia is your best choice for authentic Ethiopian food in Nairobi. We enjoy going as a family on Sunday afternoons. The owner is great with the kids and the service is excellent. If you want "fast food" don't opt for Ethiopian and if you want fast Ethiopian, then you don't really want Ethiopian. Relax, enjoy the experience and savor the remarkable flavors. The lamb tibs is my favorite among many many excellent dishes.