stir sugar cumin and mustard in a small bowl. Add 1 1/2 teaspoon salt and 1 teaspoon ground black pepper and story. Press sugar mixture evenly onto top surface of fish.

Heat oil in non stick skillet over medium heat. cook fish rub side down 4 minutes or until rub dissolves and darkens slightly. Flip fish and cook 3 minutes more or until fish is opaque.