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Heat oven to 200C/180C fan/gas 6. Using a 6cm pastry cutter, cut out circles from the tortillas. Heat the tortilla circles from the tortillas. Heat the tortilla circles for 5 secs in a microwave, then press into a mini muffin tin. Brush with the oil and bake for 8-10 mins until golden and crisp. Remove and leave to cool completely.
Chop the prawns into small pieces and marinate in the lime juice for 5 mins. Put the prawns and lime juice in a bowl with the mango, red onion, chilli and coriander. Season, mix together and use to fill the corn cups just before serving. Top with coriander leaves.