Add the coconut oil to a saucepan over medium heat. Sautee the onions, pepper, and green onion for 3 minutes. Season the fish with salt and pepper and then add to the pan and cook until browned. Add the lime zest, ginger, and red pepper flakes.
In a separate bowl, combine the coconut cream with the vegetable stock and a teaspoon of arrowroot powder. Add to the pan with the the fish and vegetables and bring to a boil for about 15 minutes.