Heat some groundnut oil in a large wok over high heat. Add the fish to the wok, pressing lightly on the fillets as they cook. Cook for 3 to 4 minutes. Turn the heat down to medium.
Turn the fish over and sprinkle the garlic, ginger and chile over the fillets. Cook for a further 3 to 4 minutes, depending on the size of the fillet, until the flesh has turned opaque and flakes when poked at with a fork or a pair of chopsticks.
Season the fish with the soy sauce and sesame oil. Add the spring onion strips and chopped cilantro and cook until the herbs have wilted slightly.
To serve, garnish the fillets with the wilted herbs and serve immediately with the steamed vegetables or the scented rice and noodles if using.
Cod is a great alternative to monkfish in this recipe, but keep the skin on and cook skin-side down first until crisp and golden. Ensure when buying cod though it comes from sustainable sources.