In a large cast iron skillet, heat the oil over medium heat. Add the leeks, the thyme, generous pinches of sea salt and pepper, and cook slowly, stirring often, until the leeks are soft and tender, about 8-10 minutes. Then add the mushrooms and cook until they are tender, about 5 minutes more. Add the jerk spices and mix well. Add the coconut milk and heat through. Add the cooked pasta, mix well, and take off the heat. Taste and adjust seasonings, if necessary. Garnish with fresh parsley and toasted pecans.