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Heat a film of oil in a large frying pan or wok over medium-high heat. Add the garlic, ginger and chilli, and cook for 1 minute until fragrant.
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Add the red onion and stir-fry for 2–3 minutes until just softened.
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Add the prawns and cook for 2–3 minutes, stirring often, until pink and nearly cooked through. Add the green beans and cook for a further 3–4 minutes until bright green and tender-crisp.
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Pour in the soy sauce, oyster sauce and sesame oil, then stir in the cornflour mixture. Cook for 1–2 minutes until the sauce thickens slightly and the prawns are cooked through. Season to taste with salt and pepper.
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Divide the rice between plates and top with the prawn and green bean stir-fry. Garnish with coriander and spring onion. Serve with lime wedges for squeezing.