Food & Cooking Recipes Main Dish Recipes Casserole Recipes Cauliflower and Leek Gratin 3.5 (39) 1 Review By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on September 28, 2016 Print Rate It Share Share Tweet Pin Email This bubbly and cheesy dish makes for a delicious dinner party side. Serve with Salt and Pepper Crusted Rack of Lamb and Wilted Mustard Greens. Ingredients 3 tablespoons unsalted butter, plus more for baking dish 1 (3-pound) head cauliflower, cut into florets 2 leeks, white and light green parts only, trimmed, and sliced crosswise into ¼-inch pieces 2 small shallots, peeled and sliced into ⅛-inch rounds 1 to 2 teaspoons crushed red-pepper flakes 1 teaspoon fresh thyme leaves, coarsely chopped ¼ cup all-purpose flour 1 ½ cups whole milk 1 ½ cups grated Gruyere cheese Coarse salt and freshly ground pepper Directions Preheat oven to 350 degrees. Butter a shallow 2-quart baking dish and set aside. Bring a large pot of salted water to a boil. Add cauliflower and cook until slightly tender, 2 to 3 minutes. Drain and rinse under cold water; transfer to a large bowl and set aside. Melt butter in a small saucepan over medium-low heat. Add leeks, shallots, red-pepper flakes, and thyme; cook, stirring, until softened, about 5 minutes. Stir in flour until well combined. Slowly add milk, stirring constantly, until well combined. Increase heat to medium-high and bring to a boil; let boil 2 to 3 minutes until thickened. Remove from heat and stir in 3/4 cups cheese; season with salt and pepper. Pour leek mixture over cauliflower mixture and stir until cauliflower is well coated; transfer to prepared baking dish. Sprinkle remaining 3/4 cup cheese over top. Transfer to oven and bake until bubbly, about 25 minutes. Meanwhile, preheat broiler. Transfer baking dish to broiler; broil until golden brown, 5 to 8 minutes. Let cool 5 to 10 minutes before serving. Rate it Print