Pat cod dry; season with salt and pepper. Mix flour and paprika in a shallow dish; whisk eggs and milk in another.

Dip fish in flour, egg and flour again. Heat 1 inch oil in a heavy skillet to 350°F; keep pan less than half full.

Fry in batches 3–4 minutes per side until golden and centers reach 145°F. Drain on a rack; serve with lemon.