Wash and finely chop the cabbage, onion, capsicum, garlic, and carrot.
Melt the butter in a pan.
Add the garlic and sauté for 1 minute.
Add all the veggies and corn, and sauté on low for 2 minutes.
Pour in 3 cups water and bring to a boil.
Mix 1½ tablespoons corn flour with ½ cup water until smooth.
Once boiling, add black pepper, salt, mixed herbs, and vinegar. Stir.
Slowly add the slurry while stirring, so no lumps form.
Simmer on low until the soup thickens a little and veggies stay slightly crunchy.
Cook longer for a thicker soup, then serve hot.