Prepare the Garlic Herb Butter: In a small bowl, mix softened butter, minced garlic, chopped parsley, lemon juice, salt, and pepper. Set aside at room temperature.
Heat the Pan: In a heavy skillet, heat olive oil over medium-high heat until shimmering.
Season the Tuna: Pat the tuna steaks dry and season generously with salt and pepper.
Sear the Tuna: Place tuna in the skillet, sear for 1.5 to 2 minutes on each side for medium-rare.
Add the Garlic Herb Butter: Add a dollop of garlic herb butter to the skillet during the last minute of cooking.
Serve: Remove tuna, let it rest for a minute before slicing, and serve hot with remaining garlic herb butter and garnishes.
