Place cod on a baking sheet, squeeze a generous amount of lemon juice over both sides of the fillet, then sprinkle both sides with a pinch of salt, generously with black pepper and, lastly, with the lemon zest.
Bake about 12 minutes or so, until thoroughly cooked through and fish flakes easily with a fork. Squeeze additional lemon over the fish just before serving, if you’d like.
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