Oil is ready to use when it looks smooth and flows easily like water. The surface should also glisten slightly. [4] X Research source If you’re still not sure, you can add a small piece of fennel to the oil. If it sizzles right away, the oil is already heated and you can add the remaining fennel.
Use a quarter cup olive oil if you’re cooking more than one bulb. For a single bulb, an eighth cup of olive oil should be sufficient.
Serve the fennel immediately after cooking it. You can keep leftovers in a covered container in the fridge.
