Soak soy chunks in salted hot water for 10-15 minutes.
Drain and squeeze soy chunks dry.
Put soy chunks and cauliflower and red onion in marinade for 30 minutes. Set aside.
Heat oven to 180°C. Place soy chunks and cauliflower in oven tray, spread evenly and cook till core temperature reaches 75°C for 30 seconds.
Set sauce mix aside.
Heat up a large sauté pan and turn heat down to medium once smoking. Add vegetable oil.
Add red onion wedges and stir-fry till onions are translucent.
Add sauce mix to the onions and cook for a minute. Add water and bring to boil. Remove from heat.
Pour sauce to cooked roasted soy chunks and cauliflower.
Serve with rice or noodles.