In a saucepan of boiling water par-boil the beef for 5-10 seconds. (DO NOT cook it through!).
This helps remove odour, scum, and excess fats.
Drain and set aside.
Get your sauce ready.
Add all ingredients for the sauce in a bowl.
Heat pan on medium-high heat with sesame oil.
Stir fry onions until slightly soft.
Pour in sauce mixture.
Bring to boil.
Add beef and coat well.
Cover and let it simmer on low heat for 5 mins.
Then uncover and let sauce reduce a little.
Season to taste.
In another pot, blanch veg in salted water.
Serve over white rice and garnish with chopped spring onions.