Place the cod filet in a baking dish and brush with olive oil. Season it liberally with salt and pepper.
Transfer the cod to the oven and broil for 8-10 minutes, or until it flakes easily with a fork.
Meanwhile, heat the coconut oil in a large skillet over medium heat. Add the sliced plantain and cook until golden brown, about 4-5 minutes per side. Transfer to a paper towel lined plate and season with sea salt.
Divide the remaining ingredients between two plates or bowls and top with the cod and fried plantains. Serve with the special sauce.
For the Special Sauce
Combine all the ingredients in a bowl and mix well. Refrigerate until ready to serve.