Finely chop the spring onions, garlic and chilli (if used).
Cut the carrot and sweet potatoes into bite-sized chunks.
Heat one spoonful of oil in a saucepan and gently sauté the spring onion for about five minutes, then add the garlic, chilli, carrot and sweet potato pieces. Cook for 5 minutes under cover. Add the cumin, dried oregano and chilli flakes, then stir for 30 seconds.
Add the stock pot and powder, then pour over the water and bring to the boil. Cook for ten minutes, then add the sliced cabbage. Cook for another five minutes or so.
Turn off the heat and stir in the lime juice.
Serve with tortilla or flatbread.