Pre-heat the oven to 160°c and spray a large, oven proof frying pan with low calorie cooking spray.
In a mixing bowl combine the pork, onion, garlic, oregano, paprika, cayenne pepper and cumin. Mix well then transfer to the frying pan. Cook for about 5 minutes on a medium heat until the meat has sealed all over.
Add the orange and lime juice to the pan along with the cola, chicken stock, sweetener and bay leaves. Cover with the lid and place into the oven. Cook for 4 hours or until the pork is tender.
Take the pan out and turn the oven up to 200°c. Transfer the cooked pork to a mixing bowl and then pull it apart with two forks.
Add the shredded meat to a baking tray and pop back into the oven for 10-15 until the edges are crispy. Keep warm until you’re ready to serve.
Mix the pineapple, mango, red chilli, coriander, red onion and lime juice in a bowl. Season with salt and pepper to taste, then put to one side.
Arrange the little gem lettuce leaves on a plate and fill with the shredded pork. Top with the salsa and serve with a wedge of fresh lime.