Preheat your oven to 200C/Fan.
Rinsing the fennel under cold water, remove the outer layers. Cut the fennel bulb’s stalks off and slice down the width of the bulb, removing the hard centre (heart) of the fennel. Carefully remove any fennel fronds from the cut-off stalks (you'll be using these to garnish so keep to one side).
Taking a sharp knife, cut the halved bulb into slices – we like to cut ours thick, but slim is also great for less crunch.