Food & Cooking Recipes Appetizers Leek and Olive Tart with Two Cheeses 3.7 (7) 1 Review 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 June 12, 2017 Print Share Share Tweet Pin Email Servings: 4 This savory tart brings together meltingly tender leeks, soft ripened and aged cheeses, and a crisp, golden buttery backdrop of store-bought puff pastry. Ingredients 15 to 20 baby leeks or 3 large leeks, white and pale-green parts only 1 tablespoon unsalted butter 2 tablespoons extra-virgin olive oil Coarse salt 1 teaspoon finely chopped fresh thyme 1 box (14 ounces) frozen puff pastry, such as Dufour, thawed 1 large egg beaten with 1 tablespoon water ¼ cup freshly grated Parmesan cheese Scant 1/4 cup Nicoise olives, pitted 4 ounces Pave d'Affinois or other soft-ripened cheese (such as Camembert or Perail), thinly sliced Directions If using baby leeks, halve lengthwise and trim to about 3 inches long. If using regular leeks, cut crosswise into 3-inch pieces; halve each piece lengthwise, then cut into 3/8-inch-thick strips (about 5 cups). Rinse well, and drain; set aside. Melt butter with oil in a medium saute pan over medium heat. Add leeks and 1/4 teaspoon salt; cook, stirring occasionally, 5 minutes. Reduce heat to medium-low; cover, and cook, stirring occasionally, until leeks are tender but not browned, about 15 minutes. Stir in thyme. Leeks can be refrigerated in an airtight container up to 1 day; bring to room temperature before assembling tart. Cut or roll out pastry to a 6-by-14-inch rectangle; place on a parchment-lined baking sheet (reserve remaining pastry for another use). Score a 3/4-inch border. Brush with egg wash; sprinkle with Parmesan. Refrigerate 30 minutes. Preheat oven to 375 degrees. Bake pastry until golden, 10 to 15 minutes. Remove from oven, and press center area with a metal spatula. Arrange leeks end to end in rows within border of pastry. Scatter olives over leeks. Bake until crust is golden brown, about 10 minutes. If bottom is soft, bake 3 to 5 minutes more. Remove tart from oven, and arrange soft cheese over top. Using an offset spatula, slide tart onto a wire rack; let cool slightly. Cut into pieces; serve warm or at room temperature (tart can stand at room temperature up to 1 hour). Print