Take a frying pan and add vegetable oil.
Let the oil heat until it smokes a little.
Now, add the momo and pan-fry them until golden.
In the meantime, take a bowl and add schezwan sauce, tomato ketchup, chili oil, and vinegar.
Whisk them thoroughly. Keep them aside.
Next, chop the garlic finely. Also, chop the spring onion.
Now, take a wok or Kadhai and add a bit of oil.
Let it heat nicely.
Then add the finely chopped onion, garlic, and spring onion (white part). Keep the flame on medium.
Toss and fry them for about a minute and then add the sauce.
Stir everything together and then add the pan-fried momo.
Combine them well, coating each momo with the sauce.
Take a taste test. Add salt if needed.
Turn the flame on high and sauté them for a few seconds.
When done, transfer them to a plate.