I started off by frying diced onion in sesame oil and adding the brown sugar for some caramelizing effect.
Next I threw in my vegetables (diced red pepper, courgette and tomato) and all of the other ingredients listed above (plus Worcestershire Sauce).
In a pot I boiled asian noodles and sausage meat balls and stirred them into my sweet and sour sauce.
I am not sure it's the best ever sweet and sour sauce but a damn fine one. There wasn't a shred of noodle or drop of sauce left.