Have you thought about growing celeriac?
If not then perhaps now is the time! It may not win any beauty awards (very knobbly) but it will win you over with the taste. Choose to sow in late winter/early spring in the warmth of a propagator or from April you can start them under cloches or in an unheated greenhouse. Germination can be erratic but have patience – plant out in May/June. Celeriac can give you a harvest from September to May. Enjoy them grated raw in salads, pureed, boiled, put them in sops, add them to casseroles, serve them with a cheese sauce or turn them into chips (after scrummy words fails me!) Actually we roast ours - first toss the ‘chips’ in olive oil and herbs then bake like you would for roast parsnips - this works brilliantly.