Preheat the oven to 200˚C/400˚F/Gas 6 and grease a large baking dish. Trim the leafy fronds at the top of the fennel and leave to one side. Slice each bulb fairly thinly lengthways. Cover the base of the dish with a layer of half of the fennel slices, season lightly with salt and pepper and then repeat with half of the potato slices, then all of the beetroot slices, then the rest of the potato slices and finally the rest of the fennel slices, seasoning throughout.
Pour the soya cream into a jug and add the garlic and half of the grated soya cheese. Pour the cream mixture over the top of the vegetables and sprinkle the remaining grated soya cheese over the top. Bake for 40–45 minutes until the cheese on the top is golden brown and the vegetables are tender. Serve hot.
Recipe by Grace Cheetham at https://www.gracecheetham.com/gluten-free-dairy-free-fennel-beetroot-potato-gratin