Add 2 tablespoons chopped parsley. Whisk in butter to thicken sauce slightly.
04Drain pasta in a colander. Do not rinse pasta with water - this will remove the pasta's natural starches. Place pasta into the clam saute pan and mix thoroughly. Check seasoning.05Pour pasta into large serving bowl. Zest lemon over the dish, being carefull not to zest the white part of the lemon, which is bitter. Garnish with remaining parsley. Serve immediately.