Bring a large pot of lightly salted water to a boil. Add chopped kale. Return to a boil and cook 2 minutes. Drain and press out most of the liquid.Advertisement
Meanwhile, melt butter in a large skillet over medium heat. Add shallots and sauté 3 minutes, until softened. Add garlic; cook 1 minute. Stir in flour; cook 1 minute. Whisk in milk. Bring to a low simmer and cook 3 to 5 minutes, until thickened. Stir in salt, nutmeg and pepper. Fold in kale until well coated with sauce.