First melt the margarine in a saucepan and then add the flour (roux). Stir vigorously and then deglaze with the water (mixed with stock powder). Add the tomato paste, continue to stir vigorously so that no lumps form. When everything is a homogeneous mass, pour in the milk. You may have to give in a little liquid.
Press the sausage out of the skin, shape into dumplings and add to the sauce. Let the whole thing steep for approx. 20 minutes on a low setting. Season with salt (little, as the sausage is already salted), pepper, paprika and spices. Italian herbs also go very well with it. Noodles are perfect as a side dish.