In a blender, add 1 large chopped tomato and 4-5 soaked Kashmiri red chilies. Blend without adding water until you achieve a smooth paste. Set aside this tomato-chili paste.
In a kadai, heat 2 tablespoons of oil. Add ½ cup of chopped onion, 1 tablespoon of chopped ginger, 2 tablespoons of chopped garlic, and 1 chopped green chili. Sauté over high heat.
Now, add ½ cup of chopped capsicum and 2 tablespoons of chopped green onion bulbs. Continue to sauté. Season with salt, ¼ teaspoon of black pepper powder, and ¼ teaspoon of garam masala. Mix well.
Add the prepared tomato-chili paste and continue sautéing.
Pour in ½ cup of water and bring it to a boil.
In a separate bowl, mix 1 tablespoon of corn flour with 3 tablespoons of water to create a slurry.
Add this cornflour mixture to the kadai. Stir well.
As the mixture starts to thicken, add the prepared cabbage Manchurian balls, some chopped spring onions, and coriander leaves.
Mix everything together. Your dry cabbage Manchurian is now ready to be served hot."