To a wok with a lid (or a steaming pot with a lid) add the green beans and 1 cup water on high heat.
Steam for 3-4 minutes, then drain any remaining water and set green beans aside.
Add the canola oil and heat on medium-high heat.
Add the green beans and stir fry them for 1-2 minutes.
Add in the garlic, green onions, chili-garlic paste and stir to combine.
Cook the garlic mixture for 30 seconds to a minute then add in the soy sauce, rice vinegar, sugar, water and chili flakes.
Cook for an additional 1-2 minutes or until most of the liquids are completely cooked off.
Garnish with sesame seeds if desired.