Clean the carrots, onions and leeks and cut into small cubes. Then roast in the pan with the rapeseed oil for about 5 minutes over medium to high heat.
Cut or quarter the mushrooms into approx. 1cm thick slices. Finely chop the garlic. Then add both to the pan and roast for another 3 minutes. Turn only seldom.
Add sugar, thyme and tomato paste to the mushroom-vegetable mixture and stir in for a minute. Add salt and pepper. Deglaze with the wine and simmer on a low heat for 15 minutes. Turn seldom.
It`s ready when the wine is reduced to a dark, thick sauce. Then stir in the butter as you like and serve sprinkled with parsley.