Heat 1 tablespoon sesame oil in a wok or kadai or a pan. You can also use peanut oil or sunflower oil. Keep the flame to low to medium.
Add ½ teaspoon finely chopped ginger and ½ teaspoon finely chopped garlic.
Saute for some seconds till the raw aroma of both ginger and garlic goes away.
Now add ¼ cup chopped spring onions.
Increase the heat to medium or high and stir fry onions for a minute.
Now add the shredded veggies. mix very well.
Stir fry vegetables on medium to high flame for 4 to 5 minutes.
Now reduce the flame and add the sauces. mix very well with the stir fried veggies.
Add 1.5 to 1.75 cups water and mix well.
Stir the corn flour paste (as the corn flour settles down) and then add slowly in a stream in the pan.
As soon as you add corn flour paste, quickly stir so that lumps are not formed. In case lumps do form, then use a wired whisk and stir the gravy (sauce).
Season with salt as per taste. Add less salt as the sauces already have salt in them.
Add ¼ teaspoon black pepper powder or crushed black pepper. Mix very well.
Simmer on a low to medium flame for 2 to 3 minutes till the sauce thickens. Check the taste and the corn flour’s raw taste should not be there.
Now add 1 teaspoon rice vinegar or apple cider vinegar or white vinegar.
Add ½ to 1 teaspoon sugar. You can add less or more sugar as required. Check the taste before adding sugar and if required then only add sugar. Mix very well.
Switch off the flame and now add 2 tablespoons spring onion greens.
Mix well. The chop suey sauce is ready to be served. Check the final taste and add salt, sugar, black pepper, soy sauce or any of the sauces if required.