Hearty Swedish layered autumn root vegetable gratin featuring sliced carrots, parsnips, celeriac, and potatoes baked in a thyme and garlic cream sauce with a golden cheese crust.
Slice all root vegetables uniformly thin (3mm) using a mandoline slicer.
In a jug, mix double cream, vegetable broth, crushed garlic, fresh thyme leaves, 1.5 tsp salt, and black pepper.
Arrange sliced root vegetables in overlapping layers in a buttered baking dish. Pour the seasoned cream over the vegetables and press down gently.
Scatter grated cheese over top. Bake at 190°C for 50-60 minutes until root vegetables are tender and the surface is golden and bubbling.