1. In a mixing bowl, combine cabbage, carrot, capsicum, all-purpose flour, cornflour, ginger-garlic paste, and salt. Mix well.
2. Shape the mixture into small balls.
3. Heat oil in a frying pan and deep fry the balls until golden brown. Drain on paper towels.
4. In a saucepan, heat oil and sauté onions, capsicum, and ginger-garlic paste until fragrant.
5. Add soy sauce, tomato ketchup, chili sauce, and water. Bring to a boil.
6. Add the cornflour slurry and cook until the gravy thickens.
7. Add the fried vegetable balls to the gravy and simmer for a few minutes.
8. Garnish with chopped spring onions and serve hot.