How to cook kale greens? Start by rinsing them thoroughly under cold water. Remove the tough stems and chop the leaves into bite-sized pieces. Heat olive oil in a skillet over medium heat, then add minced garlic and sauté until fragrant. Add the kale leaves to the skillet and cook, stirring occasionally, until they wilt and become tender, about 5-7 minutes. Season with salt, pepper, and a squeeze of lemon juice before serving.