Start by chopping the onion and mincing your garlic. If you use whole cumin, grind it.
Sautée onions in a pan in the oil over medium heat for 4-5 minutes. Add cumin, sautée for 1 more minute. Lastly add garlic and sautée for another minute.
Add ground meat and cook for 6-8 minutes over high heat. Wait for all the liquid to evaporate and meat to become brown.
Add remaining spices: salt, black pepper, cinnamon, chili peppers. Also add tomato purée and water.
Fry for 6-8 minutes over high heat, let all the liquid to evaporate.