1 pound leeks, white and light green parts only, halved
lengthwise, sliced thin, and washed thoroughly
2 garlic cloves, minced
Pinch cayenne pepper
¼ cup dry white wine
4 cups water
1 cup heavy cream
12 ounces jumbo pasta shells
2 tablespoons chopped fresh basil
Instructions
Adjust oven rack to middle position and heat oven to
degrees. Combine ricotta, ½ cup Parmesan,
lemon zest, ¼ teaspoon salt, and ¼ teaspoon pepper
in bowl; cover and refrigerate until needed.
Heat oil in 12-inch ovensafe nonstick skillet over
medium heat until shimmering. Add squash,
leeks, and ½ teaspoon salt and cook until leeks
are softened, about 5 minutes. Stir in garlic and
cayenne and cook until fragrant, about 30 seconds.
Add wine and cook until almost completely evapo-
rated, about 1 minute.
Stir in water and cream, then add pasta. Increase heat
to medium-high and cook at vigorous simmer, stirring
gently and often, until pasta is tender and liquid has
thickened, about 15 minutes.
Season with salt and pepper to taste. Sprinkle
remaining ½ cup Parmesan over top, then dollop
evenly with ricotta mixture. Transfer skillet to oven and
bake until Parmesan is melted and spotty brown,
about 5 minutes. Remove skillet from oven (skillet
handle will be hot). Let cool for 10 minutes, then
sprinkle with basil and serve.