A sauce of tangy feta and Greek yogurt (inspired by a recipe from Yotam Ottolenghi and Sami Tamimi) anchors the components of this creamy, vegetable-filled pasta, and the combination of asparagus and peas makes it especially colorful and perfect for spring. Although the textures are at their most supple when served hot or warm, this dish also works well at room temperature, served as a pasta salad.
