Place rice in a colander and rinse really well.
Turn Instant Pot to saute and let heat up.
Once heated, add in oil, onion, jalapeno, and garlic. Saute for 2-3 minutes.
Turn Instant Pot OFF.
Add in stock and scrape up any browned bits on the bottom of the inner pot.
Add in seasonings and stir well. Add in rice and gently push down with a spoon to submerge in stock. Top with tomato sauce.
Place lid on the Instant Pot and be sure vent knob is pointed to sealed.
Cook on HIGH pressure for 3 minutes for long-grain white rice, and 22 minutes for long-grain brown rice.
Let pressure release naturally all the way.
Remove lid and fluff rice with a fork, while stirring in the tomato sauce.
Stir in butter if desired and serve.
