Cut the red onion into cubes, sweat it in coconut oil and then pour the red wine over it. Add cola, molasses and balsamic vinegar and let it reduce well. Then stir in the cooking chocolate, chopped into small pieces, and after boiling briefly, add the frozen blueberries. Simmer gently for about 30 minutes, then mix well with the hand blender. Add the remaining ingredients. Then simmer gently for about two hours.