Preheat the over at 250°C. Bake the fish fillet for 10-15 mins or until fish is cooked (season with salt and pepper and some olive oil). Remove and set aside.
Meanwhile, use a bowl to combine and whisk sesame paste, lemon juice and water. Whisk well until mixture is smooth then set aside.
Warm olive oil in a medium saucepan and saute onion for 5 minutes or until yellow-golden color then add the additional water. Bring to boil and simmer until water is almost evaporated.
Add the prepared sesame sauce over and the MAGGI® Vegetable Bouillon cubes and cook while stirring constantly over medium heat until it boils, then simmer for 5 mins and remove from heat.
Place the cooked fish fillet in a large plate and pour the sauce over and serve with white rice.