Whole-Grain Spaghetti With Kale and Tomatoes
Cook the pasta according to the package directions. Reserve ¼ cup of the cooking water; drain the pasta and return it to the pot.
Meanwhile, heat the oil in a large skillet over medium-high heat. Add the onion, garlic, ¼ teaspoon salt, and ⅛ teaspoon pepper. Cook, stirring occasionally, until beginning to brown, 4 to 5 minutes.
Add the kale and cook, tossing frequently, until tender, 2 to 3 minutes. Add the tomatoes and cook, tossing frequently, until the tomatoes begin to soften, 1 to 2 minutes more.