INGREDIENTS
1 lb
linguine, uncooked
1
egg yolk
1/3 cup
heavy cream
1/4 cup
freshly grated Parmesan
1
lemon, zested, and juice of 1/2, plus more juice, as needed
Salt
Freshly milled black pepper
2 tbsp
unsalted butter
1
to 2 tablespoons chopped parsley leaves, optional