Wash and peel the turnips and, depending on their size, possibly halve them. Potatoes peel, wash, halve or quarter. Cook potatoes in little boiling salted water for about 20 minutes.
Steam the turnips in 3/8 litres of boiling salted water for about 15 minutes. In the meantime, wash the chives, dab dry and cut into small rolls, except for a little garnish. Drain and collect the vegetable water from the turnips.
Heat the fat in a saucepan and sauté the flour in it. Add 1/4 litre vegetable water and milk while stirring, bring to the boil and simmer for about 5 minutes. Season the sauce with vegetable stock, pepper and possibly some salt.
Add the chives and turnips to the sauce and warm them up. Heat the oil in a large pan and place the steaks in the hot oil. Fry for 3-4 minutes while turning. Season with salt and coarse pepper and arrange on plates with the turnips and potatoes.
Serve garnished with chives.