Recipe Tip Use prawns with tails on, as this prevents them from curling up when frying. Share your version of this recipe Some add onions, tomatoes and chillies to their prawn fry, while some prefer it the spice-mix way. What’s your version of this dish? Please share it with us! Frequently Asked Questions For how long should I fry prawns? Small-medium sized prawns take around 3-4 minutes, whereas large prawns take about 5-8 minutes. Overcooking prawns will make them hard and rubbery. How do I know if the prawns are cooked? When cooked well, prawns turn pink in colour on the outside with red tails. Their flesh is slightly opaque and lightly whitish. What is the best temperature to fry prawns? For best results, fry the marinated prawns on low-medium heat.