Place the lemon zest, black pepper, garlic, oregano and salt on a
large plate and mix to combine. Dredge both sides of the
swordfish in the mixture.
Place a large cast-iron skillet over medium high heat and when it
is hot, add the oil. Add the swordfish and cook until browned,
about 3-5 minutes per side, depending upon the thickness of the
swordfish.
Serve immediately, garnished with the lemon quarter.