Make the chimichurri sauce according to the recipe and set aside until ready to use.
Next, season the halibut on both sides with salt and pepper.
Add the oil to a large frying pan and heat over high heat until it begins to lightly smoke.
Place in the halibut fillets, turn the heat down to medium-high, add in the butter and cook for 3 to 3 ½ minutes per side or until golden brown and cooked throughout.
Let the fish rest for 1 to 2 minutes before pouring on some of the chimichurri sauce and garnishing with optional lemon slices.
