Pressure Cooker Russian Sweet & Sour Cabbage Soup

Ingredients

• 1/4 cup oil
• 4 tablespoons butter or 4 tablespoons margarine
• 1 onion , thinly sliced
• 4 cups grated red cabbage
• 4 cups grated white cabbage
• 2 cloves garlic , minced
• 1/2 cup seedless raisin
• 1/2 cup dark brown sugar
• 1 teaspoon caraway seed
• 2 quarts chicken stock
• 1 cup dry white wine
• 1/4 cup cider vinegar