Pre-heat oven to 140ºC.
Place ribs, Chinese five spice, half of the chilli flakes, garlic powder, bay leaves, sweetener, soy sauce, diet cola and the orange juice into ovenproof dish and cover with tin foil.
Cook in the preheated oven for 3 hours then remove the foil and continue for another hour until ribs are tender.
Spray a frying pan with low calorie cooking spray and cook the peppers and onions for 1 to 2 minutes, then add the cooked ribs along with the remaining dried chilli flakes and the toasted sea salt. Fry for 2 to 3 more minutes.