In a large, deep frypan fry the bacon over medium-high heat until evenly brown. Drain the bacon fat. Add the onions to the pan with the bacon and cook 5 minutes or until the onions are translucent. Stir in the prawns and chipotle chillies; cook 4 minutes or until heated through.
Heat tortillas on an ungreased frypan over medium-high heat for 10 to 15 seconds. Turn and heat for another 5 to 10 seconds. Fill the heated tortillas with prawns mixture. Sprinkle with coriander, lime juice and salt.