Food & Cooking Recipes Main Dish Recipes Casserole Recipes Sweet Potato-Cauliflower Gratin with Crispy Sage Leaves By Martha Stewart Editors Martha Stewart Editors Facebook Instagram Twitter Website An article attributed to "Martha Stewart Editors" indicates when several writers and editors have contributed to an article over the years. These collaborations allow us to provide you with the most accurate, up-to-date, and comprehensive information available.The Martha Stewart team aims to teach and inspire readers daily with tested-until-perfected recipes, creative DIY projects, and elevated home and entertaining ideas. They are experts in their fields who research, create, and test the best ways to help readers design the life they want. The joy is in the doing. Editorial Guidelines Updated on January 21, 2021 Print Share Share Tweet Pin Email Photo: Johnny Miller Servings: 8 This potato gratin dish uses a lightened-up bechamel sauce, so you get the richness without the butter. And the fancy sage garnish couldn't be easier: All you need is 10 seconds to flash-fry the fresh leaves in some vegetable oil. Ingredients 2 tablespoons extra-virgin olive oil 3 tablespoons all-purpose flour 1 cup whole milk ¼ cup plus 1 tablespoon freshly grated Parmesan 20 fresh sage leaves, plus 1 tablespoon chopped Coarse salt and freshly ground pepper 2 pounds sweet potatoes, peeled and sliced ¼ inch thick 1 head cauliflower, quartered and sliced ¼-inch thick Vegetable oil, for crisping sage Directions Heat oven to 350 degrees. Heat olive oil in a small pot over medium heat. Add flour and cook, stirring, 1 minute. Slowly whisk in milk and 1 cup water. Cook, whisking, until thick enough to coat the back of a spoon, about 12 minutes. Remove from heat and stir in 1/4 cup Parmesan and the chopped sage. Season with salt and pepper. Pour a third of the sauce in the bottom of a 9-by-13-inch casserole dish. Arrange a third of the sweet potato and cauliflower slices along the bottom. Season with salt and pepper. Repeat twice with remaining sauce and vegetables. Cover dish with parchment-lined foil and bake until vegetables are tender, about 1 hour. Raise oven temperature to 425 degrees. Remove foil and sprinkle with remaining tablespoon of cheese. Bake until golden brown, about 20 minutes. Let stand 10 minutes before serving. Meanwhile, crisp sage leaves: Heat 1 inch vegetable oil in a small pot over medium-high heat until surface is shimmering slightly. Add a few leaves at a time (they'll bubble up) and cook until crisp, but still bright green, about 10 seconds. Transfer to a paper towel to drain. Season with salt. Top gratin with leaves. Print