Spaghetti al Limone

Using a vegetable peeler, remove two 2"-long strips of zest from 1 lemon. Thinly slice each strip lengthwise into thin strands; set aside for serving. Finely grate remaining lemon zest into a large pot (like a Dutch oven). Cut zested lemon in half and squeeze out enough fresh lemon juice to yield 2 Tbsp. into a small bowl; set aside.

Cook 12 oz. spaghetti or other long pasta in another large pot of boiling heavily salted water according to package directions, stirring occasionally, until very al dente (pasta will finish cooking in the sauce).

Meanwhile, add ¾ cup heavy cream to pot with lemon zest and cook over medium heat, whisking often, until liquid is just beginning to simmer, about 2 minutes. Reduce heat to medium-low. Whisk in 6 Tbsp. unsalted butter, 1 Tbsp. at a time, until melted and sauce is creamy and emulsified. Remove from heat.