Heat 1 tsp olive oil in a frying pan on medium high heat. Place the cubed chicken in the frying pan and cook for 5 minutes, stirring to ensure nothing burns. Add in the chopped pancetta and chorizo and cook until the chorizo has began to brown and the pancetta has become crisp. Using a slotted spoon, remove the chicken, chorizo and pancetta from the pan and set aside in a bowl.
Place the prawns in the pan and cook for 2-3 minutes until pink, and then place in the bowl with the other cooked meats.
Add in the diced onion, red peppers, garlic and sprinkle with salt. Cook for 3-4 minutes until the onions and peppers begin to soften and then add in the paprika and saffron, white wine vinegar, chicken stock and tomatoes. Let simmer for 1-2 minutes.
Increase the heat to hight and add the cauliflower rice, peas (if not Whole30), chicken, pancetta and chorizo in the pan with the sauce, stir and then cover to allow the cauliflower to cook for approximately 10 minutes until the rice becomes tender but not mushy and begins to stick to the bottom of the pan.
Before serving arrange the prawns on top of the paella and sprinkle with the chopped parsley. Serve with slices of lemon.