Zest the orange. Cut into ½ " slices and cut off any remaining outer pith or peel. Cut orange slices into ½ inch segments. Mix orange, zest, and mint in a small dish.

Heat ½ tablespoon oil over medium heat. Add vinegar and onion and just heat through. Add to orange mixture. Season with salt and pepper.

Salt and pepper fish fillet. Sprinkle with cornmeal. Heat 1 ½ tablespoon oil in fry pan over medium high heat. Add fish and cook until it is opaque through- about 4 minutes per side. See note below if fillet has skin on one side.

Note: if fillet has skin on one side, fry that side first. When you flip the fillet you can peel off the skin. Optional - for crispier fillet, salt, pepper and sprinkle cornmeal on that side. When the other side is done flip again and cook a minute or so til the cornmeal crisps up.

Transfer fish to plate and garnish with relish.