Wash the cabbage, potatoes, and onions thoroughly, then cut them into bite-sized pieces.
Add olive oil to a pot and sauté the onions to bring out their aroma.
Add the potatoes and cabbage, then stir-fry together for 2–3 minutes.
Add water and salt, then simmer until the ingredients are cooked through.
Blend the mixture until smooth using a blender.
Simmer gently until creamy, then season with pepper to taste.