Generally, the vegetables that are added to veg manchow soup are carrot, cabbage, French beans, bell pepper, and mushrooms. Make sure to chop them very finely. You can use a manual chopper or food processor to make this step easier.
Method:
Set a wok on high heat, add oil, garlic, ginger, green chili, and celery, and sauté it for a few seconds.
Now add cabbage, carrots, bell pepper, and green beans. Sauté for 30 seconds.
Now add vegetable stock, salt, black pepper powder, soy sauce, red chili sauce, vinegar, and sugar. Mix everything well. Now bring it to a boil. It will take about 4 to 5 minutes on medium to high flame.
In a separate small bowl, take corn starch and 1 tablespoon of water to make a corn starch slurry. Mix both well.
Now add the corn starch slurry to the soup and cook the soup for 2 to 3 minutes or until it becomes thick.
Now add the corn starch slurry to the soup and cook the soup for 2 to 3 minutes or until it becomes thick.