Fry the tartar fat-free, season with salt, pepper, paprika powder and curry powder. Dice the ham and fry a little with the tartare.
In the meantime, cut the leek into 5mm thin rings, dice the zucchini and slice the mushrooms. Add the vegetables to the tartare and sauté. Pour in the vegetable stock and add the fork spaghetti. Season with tomato paste. Let the pasta cook while stirring occasionally (approx. 12 minutes). Stir in the sour cream and season again if necessary.