Heat the oil in a pan and sauté the garlic, yellow pepper, spring onion and sugar snap peas for 4-5 minutes to soften.
Coat the fish in a mixture of cornflour and plain flour. Heat the oil in a frying pan and deep-fry the fish for 2-3 minutes until crisp and golden. (CAUTION: Hot oil can be very dangerous. Do not leave unattended.)
To make the dressing, whisk together all the ingredients.
Serve the vegetables on a plate and top with the fish. Drizzle with the dressing.