Set up your Instant Pot outside (shade is ideal for visibility and safety). Select Sauté mode.
Heat the oil, then stir in the rice and toast, stirring frequently, until golden (about 4–5 minutes).
Add onion and garlic (if using), cook for 1 more minute.
Stir in tomato paste/sauce, cumin, and salt. Let it sizzle briefly.
Pour in the broth and stir to deglaze the bottom.
Cancel Sauté. Lock the lid and set to Manual/Pressure Cook – 3 minutes on high pressure.
When cooking is done, allow a 10-minute natural release, then release any remaining pressure manually.
Fluff with a fork. Optional: stir in a squeeze of lime or chopped cilantro.