Boil a large pot of salted water, add half the box of pasta + cook 10-12 min or until al dente, then drain + return to pot; toss pasta with salt/pep + 1-2 tbsp butter

Meanwhile, pat dry fish + season with salt/pep; heat 1 tbsp oil in a skillet over med-high; sear fish undisturbed 2-3 min; add 2 tbsp butter, flip fish + cook 3-4 min while basting fish with butter; continue to cook until fish is firm, opaque + cooked through

Wash + dry parsley, remove stems + roughly chop; drizzle fish with lemon juice + toss with parsley

Divide pasta to plates, topping with fish + pan sauce