Florence fennel is vegetable, not the herb
You will need
Trim the green feathery levels from the fennel and reserve for garnish. Slice the fennel thinly and scatter over the bottom of a shallow ovenproof dish.
Cover the fennel with the slices of potato and play the bay leaf on top. Pour over the vermouth and 4 tbsp water, then sprinkle with salt and pepper to taste
Place the prepare trout on top of the fennel and potato, and dot with the butter
Cover tightly with foil and bake in the oven at 180C/305F/Gas Mark 4 for about 40 minutes.
Remove foil to serve, chopping the reserved fennel tops finely and sprinkle over the fish.
cooking for one or two