Put potatoes and onion into a soup pot and cover with water. Add salt, cover and bring to a boil. Reduce heat and simmer until potatoes are cooked.
Cook carrots and farmer’s sausage separately.
Add butter, milk, and water to potatoes. Add pre-cooked carrots, sausage, soup mix (dissolve in water first so it is not lumpy – add more water if needed). Bring to boil.
This is very chunky soup and is a meal in itself.