Vegetable Stew With Nut Dumplings

• 1 parsley sprig
• 1 celery leaf
• 140 gr potatoes
• 65 gr parsnips
• 60 gr turnips
• 60 gr carrots
• 60 ml oil
• 32 gr wholewheat flour
• 32 gr wholewheat breadcrumbs
• 30 gr walnuts (finely chopped)