How to Make It
Place cauliflower in a 6-quart Instant Pot; add 1 cup water. Close and lock the lid of the Instant Pot. Turn the steam release handle to "sealing" position. Press [Manual]; select "high pressure:, and use [-] or [+] to choose 2 minutes pressure cooking time. When time is up, turn cooker off. Open the cooker using quick pressure release. Chop cauliflower into florets. Toss with fennel.
Combine oil and remaining ingredients in a large bowl, stirring with a whisk. Add cauliflower mixture; toss to coat.