How to Make It
Turn an Instant Pot to the “sauté” setting. Melt butter in pot until starting to foam, about 2 minutes. Add onion and salt; cook, stirring occasionally, until starting to soften, about 4 minutes.
Add broth, rice, and saffron, and stir to submerge rice in liquid. Cover with lid, and turn to “rice” setting, making sure steam valve is closed. When done, let stand 10 minutes.
Open steam valve, and allow remaining steam to escape. Carefully remove lid, fluff with a fork, and serve immediately.