Gluten-Free Hot and Sour Soup

Ingredients

• 6 cups Massel Vegetable Broth (Made using 3 Massel Vegetable Ultracubes or 3 teaspoons Massel Vegetable Stock Powder)
• 1 tablespoon oil
• 1 small onion (finely chopped)
• 1 small cabbage (about the size of a grapefruit
• finely chopped)
• 1 425g/15oz can tomatoes (blended smooth)
• 1/4 cup tamari sauce
• 1/3 cup seasoned rice vinegar
• 1 teaspoon red chili flakes
• Black pepper (to taste)
• Cooked rice noodles (enough for each bowl)