Scrub and scrape the carrot, turnip, parsnip and artichokes. Peel the potato and onions. Shred the onions and put them into a stew-pan with the nutter. Shake over the fire, and fry until brown, but do not burn or the flavour of the stew will be completely spoilt. Cut the carrot and parsnip and potato into quarters, the artichokes into halves, and put into the stew-pan with the onions. Barely cover with water. Bring to the boil and stew very gently until tender. Skin the tomatoes, break in halves, and cook slowly to a pulp in a separate pan. Add these, with the lemon juice, to the stew, and slightly thicken with a little wholemeal flour just before serving.