Sauté: Heat oil in a pot over medium heat. Sauté onion until soft. Add tomatoes, coriander, and cumin; cook 3 minutes.
Cook soup: Add meat or vegetables, water or broth, salt, and pepper. Bring to a boil, then simmer 20-25 minutes until meat is tender or vegetables are soft.
Serve: Garnish with cilantro and serve with canjeero or bariis.