Clean the mushrooms, wash them thoroughly and let them dry on a tea towel. Peel and finely dice the shallots. Wash the tomatoes. Wash chives, dab dry and cut into fine rings.
Heat the oil in a large, coated pan. Press the sausage meat as balls into the pan, fry it all around and take it out. Add the mushrooms to the pan and fry for approx. 2 minutes, turning them over.
Add the shallots and fry for 2-3 minutes, season with salt and pepper. Prepare pasta in boiling salted water according to package instructions. Deglaze mushrooms with milk, cream and stock, bring to the boil and simmer gently for 3-4 minutes.
Stir the starch with a little water until smooth, making the sauce slightly creamy. Add the meatballs, tomatoes and half of the chives to the mushrooms and cook for about 3 minutes. Season to taste with salt, pepper, sugar and nutmeg.
Drain the pasta. Arrange noodles and sauce on plates, sprinkle with remaining chives.