Add the sliced cabbages, the veggie stock, and vinegar to the pan. Cover and cook on medium-high heat for 10 minutes. Give another stir-thru. Cover and continue to cook for an additional 30 minutes, stirring occasionally. NOTE: If the liquid should evaporate before the cabbages are tender, add about 1/2 cup of water and continue to cook to your desired tenderness. ALSO NOTE: It is important that there is no liquid left in the pan to result in the full flavor of the dish. If after the 3o minutes’ cook time there is water in the pan, then remove the lid and continue to cook until all of the water has dissipated.