In a small bowl combine the sea salt, pepper and sage.
Put all your ingredients out together to create you mise en place (French for "everything in its place") In another small bowl measure out the dijon.
In another small bowl, melt the coconut oil and mix in the dijon, apple cider vinegar and the seasonings all together.
In a large, greased casserole dish place the chicken thighs in a single layer and smoother with the dijon mixture. Back for approximately 45 minutes or until no longer pink inside.