Heat the skillet and add a splash of oil. Season filets, sear for three minutes. Turn, add butter and thyme. Bake for three more minutes, then move to a 350 oven and bake for six minutes. Add the crust and cook for 4 minutes.
Mix all ingredients except breadcrumbs. Top fish with crab mix, then sprinkle with breadcrumbs and broil for 3 minutes.
Bring water, salt, and baking soda to a boil. Add peas, cook until tender, then strain, reserving the liquid. In a blender, add peas and mint purée, while adding a little bit of cooking liquid until smooth and pourable consistency.