How to Make It
Combine cabbage, carrot, scallion, lime juice, ¼ teaspoon salt, and ¼ teaspoon pepper in a large bowl; toss to combine. Set aside.
Melt butter in a large nonstick skillet over medium-high. Add lime zest and cook for 30 seconds. Season cod with remaining ½ teaspoon salt and ¼ teaspoon pepper; add to skillet. Cook until golden and cooked through, about 3 minutes per side.
Serve cod with slaw; top with cilantro leaves and lime wedges.