Wash the red cabbage, remove trunk and cut into fine strips. Brown the sugar in the butter until light brown in color. Add the finely chopped onion and in small cubes cut peeled apples. 

Sauté for a few minutes. Add the red cabbage and mix everything to combine. Immediately pour a little of the red wine vinegar on the cabbage so it retains the red color. 

 At the end dust cabbage with flour, season to taste and add some more red wine and/or vinegar if necessary.