Mix 3 tablespoons of vinegar and 1/2 litre of water. Wash and peel the black salsifies thoroughly, cut them into pieces and place them in the vinegar water. Cook in boiling salted water with 1 tablespoon of vinegar for 30 minutes.
Knead minced meat, egg and breadcrumbs. Season with salt, pepper and paprika. Form small balls. Heat oil in a pan. Fry the balls for 8 minutes. Clean and wash the leek and cut into fine rings.
Pour the black salsifies onto a sieve, collect the liquid and measure 1/4 litre. Melt the fat in a pot. Sweat flour in it. Deglaze with the vegetable water and milk while stirring. Season to taste with salt and pepper.
Add the leek and simmer for 5 minutes. Add meatballs and black salsify. Wash, clean and quarter the tomato and remove the seeds. Cut tomato quarters into small cubes. Arrange black salsify ragout in a bowl and serve sprinkled with tomato cubes.
It goes well with rice.