Heat oil in a wok/frying pan on high heat and stir fry garlic for 1 minute or until fragrant and starts to turn golden brown.
Add the beef and salt and stir fry until the color starts to change.

Push aside the stuff in the wok and pour the beaten egg. Quickly scramble the egg and break off any lump, do this for 15-30 seconds until the egg is no longer runny. Toss lightly so the egg, the beef, and the mustard green are mixed well.

Add the bean sprout and fresh kwetiau and stir fry for another minute.
Add chopped scallion, season with soy sauce, sweet soy sauce, and sugar, mix well.
Remove from heat and serve immediately.