stirring well. If you consider it too thick add a bit of the reserved potato water. (BTW, the right consistency is rather thick!) Season to taste with savory, pepper and salt. Optionally you can add a cube of beef stock, although that isn't really necessary (my Mom does, my Granny doesn't...). I like to season the bean stew with vinegar, but this is also a matter of taste. Just try and experiment a bit!