In a large skillet heat oil over medium heat and saute onion until softened. Add chicken and stir until halfway cooked. Add chopped cauliflower over the chicken - do not stir. Put the lid on your skillet and let the cauliflower steam while the chicken cooks through. When the cauliflower is still a little firm, but not raw, add pineapple, red pepper, tomato paste and stir through. Cook until cauliflower is done to your liking. At this point, judge your juices - if the dish is dry add ½ cup pineapple juice, apple juice or water.
In a small bowl, mix arrowroot and water to form a slurry. Add slowly, while stirring to the skillet to thicken the sauce.
Recipe by Home To Heather at https://hometoheather.com/paleo-pineapple-chicken-skillet/