Heat a wok until smoking. Add half the peanut oil and, when hot, stir-fry the snapper in two batches until golden and just cooked through, then remove. Wipe the wok clean.
Heat the remaining oil in the wok until just smoking. Stir-fry the ginger, garlic, spring onions and chilli until fragrant, then add the asparagus and snow peas and stir-fry until just tender. Return