Heat cooking oil and sesame oil in a wok; add garlic and sauté for 1 minute.
Add red chilli sauce and soy sauce and sauté for half a minute.
Add water and cook for 2 minutes.
Add white pepper, oyster sauce and button mushrooms. Stir well to combine and season to taste.
In a separate bowl, mix corn flour in 2 table spoons of water.
Add the corn flour mixture to the boiling sauce while stirring continuously. Simmer till gravy thickens.
Fry K&N's Croquettes as per instructions on pack and add to sauce, with spring onion.
Cook for an additional minute.
Serve with a glaze of sesame oil.