Preheat the oven to 350F, place coconut oil on a cast iron pan. Heat pan for about 10 minutes.

Mix the dill, mayo, and mustard together. Brush it onto the fish. Cover the fish, especially the top with the panko. It's not a big deal if the side of the fish that touches the pan gets breaded.

Remove the pan from the oven. Now gently place the fish onto the pan. Bake at 350, until the fish is cooked and the panko is golden brown.

Enjoy!