In a large mixing bowl, add chopped cabbage and spring onions. Squeeze out extra moisture.
Add carrots and capsicum and mix well.
Add cornflour, all-purpose flour, black pepper, salt, green chilies, and ginger-garlic paste. Combine until dough-like.
Shape into small manchurian balls. You can add extra flour if needed for binding.
Heat oil in a deep pan to fry veg manchurian balls.
Fry the vegetable balls in batches on medium heat until golden and crispy.
Drain on paper towels.
Heat 2 tbsp oil in a pan.
Add chopped garlic, ginger, and green chilies. Sauté for 1–2 minutes.
Add spring onions, bell pepper, and stir-fry briefly.
Add ketchup, chili sauce, vinegar, black pepper, and salt. Mix everything well.
Pour in water or stock. Bring to a simmer.
Add cornflour slurry and cook until the gravy thickens.
Gently add fried Manchurian balls into the gravy.
Simmer on low heat for 5–10 minutes so the balls soak up the flavors.
Turn off heat. Let it rest for a few minutes.
Garnish Veg Manchurian with chopped spring onion greens.
Serve Veg Manchurian with fried rice, noodles, or naan.