Heat 1 tablespoon of oil over medium-high heat and add onions. Fry until onions are just translucent, about 3 minutes
Add the rice, garlic, and cumin. Continue frying until rice is golden brown and nutty, about 2-3 minutes
Add tomato sauce and oregano. Stir until rice is evenly coated with tomato sauce.
Add water and bring to a rolling boil over high heat.
When the water has reached a boil, immediately cover with a lid and reduce heat to the lowest setting. Set a timer for 20 minutes and don't disturb or peek under the lid for any reason.
When the 20 minutes are up, remove from heat, continuing not to touch the lid, and let steam for another 10 minutes. After 10 minutes, fluff and serve.