Optional: For extra flavor and texture, dice one onion and fry it in a little butter or oil until golden brown. Stir the fried onions into the soup just before serving.
Storage: This soup keeps well in the refrigerator for up to 3 days. Reheat gently on the stove, adding a splash of water or milk if it has thickened too much.
Substitutions: You can use vegetable broth instead of a cube for a lighter flavor. If you prefer a richer soup, a splash of cream or milk can be added during the mashing stage.
Variations: While the traditional recipe uses fresh sausage, you could experiment with different types of fresh pork or chicken sausages. Avoid smoked sausages as the flavor profile may clash with the sweet-and-sour seasoning.