Combine the soy sauce, white vinegar, sugar, Umami 33 and red pepper flakes in a bowl and whisk to combine.
Add the olive oil to an iron skillet and place over high heat for at least 5 minutes.
Add the green beans. Cook until they are tender, about 4 minutes, stirring every 20-30 seconds.
Add the scallions and cook for about another 4 minutes, stirring every 20-30 seconds.
Add the garlic and cook for about 10 seconds. Then add the Umami 33 sauce mixture. Cook for another 20-30 seconds and then serve.
