Preparing fennel is a bit like preparing an onion! First cut off the long stem and the very end of the fennel bulb. Keep the green leafy parts for garnishing your dish if you like. Then cut off the other end of the bulb (just the very end - just like you do when cutting an onion). Then cut the bulb in half and slice each half thinly. Alternatively you can chop it more coarsely like when you prepare an onion for a savoury dish. It's up to you!