Pat the swordfish steaks thoroughly dry, then season both sides with salt and pepper.
Heat 1 tablespoon olive oil in a large skillet over medium-high heat until shimmering.
Sear the swordfish 3 to 4 minutes per side, until deep golden-brown and 130-135°F (54-57°C) internally. Transfer to a plate and tent with foil.
Wipe the skillet clean. Add remaining oil and heat over medium-high until shimmering.
Add the green beans in a single layer. Cook undisturbed 3 to 4 minutes, until charred, then stir and cook 3 to 4 minutes more.
Add the garlic and cook 30 seconds until fragrant. Season with salt and pepper.
Squeeze lemon juice over the swordfish. Plate with the green beans, top with parsley, and serve with lemon wedges.