In the pan, add 2 tablespoon of oil (you can use the same deep fried oil here).
Add chopped garlic, ginger and green chilies.
Then add chopped spring onions white and fry till raw smell goes off.
Now add capsicum, Increase the flame and cook on high flame till the capsicum is almost cooked.
Add soy sauce, vinegar, sugar and salt.
Add red chilli powder mixed in water and stir well. This is optional, I do this to get deep red colour. You can skip this step , if needed.
Add tomato ketchup or hot and sweet tomato sauce and stir well everything.
Add 3 tablespoon of water and bring to boil.
Now add fried cauliflower florets and give a quick stir for two to three minutes till sauce coats the cauliflower florets well.
Switch off the heat. Add chopped spring onions greens and blackpepper powder, mix well and serve cauliflower manchurian.
Serve gobi manchurian as a snack or as a side dish with veg fried rice or noodles.