“The sweet, caramelized onions in this recipe makes this tart so tasty. Serve it with a crisp salad and you have a great dish to serve for brunch or lunch. You and your guests will appreciate the time you spent making this for them. This is a Good Housekeeping recipe. Prep time does not include chilling time.”

Ingredients Nutrition


  1. Prepare pastry: In large bowl, combine flour and 1/4 teaspoon salt. With pastry blender or 2 knives used scissors-fashion, cut in shortening and butter until mixture resembles coarse crumbs.
  2. Sprinkle in ice water, 1 tablespoon at a time, mixing lightly with fork after each addition, until dough is just moist enough to hold together. Shape dough into disk; wrap in plastic wrap. Refrigerate 30 minutes or overnight. (If chilled overnight, let dough stand 30 minutes at room temperature before rolling.).
  3. On lightly floured surface, with floured rolling pin, roll dough into 11-inch round. Carefully place dough in 9-inch round tart pan with removable bottom. Gently press dough onto pan bottom and up side, without stretching. Fold overhang in and press dough against side of pan so it extends 1/8-inch above pan rim. Refrigerate or freeze tart shell 10 to 15 minutes to firm slightly.
  4. Preheat oven to 425°F Place pan with tart shell on cookie sheet. Line tart shell with parchment or foil and fill with pie weights or dried beans. Place in oven and bake 15 minutes.
  5. Meanwhile, prepare Onion Filling: In medium bowl, with wire whisk, beat eggs, transfer 1 tablespoon beaten eggs to cup. To eggs in bowl, add milk, thyme, 1/4 teaspoon salt, and 1/4 teaspoon coarsely ground black pepper, and mix until blended; set aside.
  6. In 12-inch non-stick skillet, heat oil on medium 1 minute. Add onion, cook 20 minutes or until golden, stirring occasionally.
  7. Remove parchment and weights from pie shell; brush with egg from cup to seal. Bake tart shell 10 to 12 minutes longer or until golden. Transfer pan with tart shell to wire rack.
  8. Spread onion evenly into warm tart shell; sprinkle with Gruyere. Carefully pour egg mixture over onion. Bake tart 23 to 25 minutes or until puffed and custard jiggles only slightly in center. Cool on wire rack 10 minutes to serve warm. Removed side of pan before serving.

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