In a small bowl, dilute cornstarch in enough water
Slice green onion, onion and garlic, thinly, separately
In a bowl, beat eggs with a little salt and the green onion
Heat pan, brush with peanut oil, turn beaten eggs into 3-4 omelets, set to side
Heat pan with a little peanut oil, saute onion and garlic til softened, stir in rinsed canned veggies, cook for a minute or two
Pour in water, add ketchup, salt, sugar, vinegar, you want to achieve sweet and sour flavor
Cook til bubbling, then pour in cornstarch, stir quickly
Pour sauce onto omelet, serve immediately with warm rice