Prepare the mojo: Heat the oil in a deep saucepan over medium heat. Add the garlic and cumin and cook until the garlic is fragrant and a pale golden brown, 1 to 2 minutes. Do not let the garlic brown too much, or it will become bitter. Stir in the lime and orange juices, salt, pepper, and oregano and ⅓ cup water. Stand back: The sauce may sputter. Bring the sauce