Peel and wash the carrots, cut them into quarters lengthwise and cut them into sticks. Clean, wash and cut leek into rings. Cook vegetables in 3/8 litres of boiling salted water for about 10 minutes. Soak rolls in cold water.
Peel onions, dice one and cut the rest into rings. Knead minced meat, squeezed out roll, diced onion, egg and mustard. Season with salt and pepper and form 4 meatballs. Heat oil in a pan and fry the meatballs for 8-10 minutes, turning them over.
Drain the vegetables, collect the vegetable water and measure 1/4 liter. Heat the fat in a pot and sauté the flour in it. Add vegetable water and milk while stirring and bring to the boil. Let simmer for about 5 minutes.
Season to taste with salt, pepper and granulated stock. Add the vegetables to the hot sauce and warm them up. Add the onion rings to the meatballs in the last 2 minutes and fry. Wash parsley, dab dry and chop except for something to garnish.
Arrange the vegetables on a deep plate, together with the meatballs. Serve sprinkled with parsley and garnished. Parsley potatoes taste good with it.