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Best Leek Tart with Gruyere and Caramelized Onions

Savory Leek and Onion Tart with Gruyere

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Prep Time 20 minutes
Cook Time 40 minutes
Total Time 1 hour
Servings 6

Ingredients
  

  • 1 package Pastry crust Store-bought or homemade
  • 2 medium Leeks Washed thoroughly and sliced
  • 1 large Yellow onion Thinly sliced
  • 1 cup Gruyere cheese Freshly grated
  • 3/4 cup Heavy cream
  • 3 large Eggs
  • 2 tbsp Unsalted butter
  • 1/2 tsp Salt
  • 1/4 tsp Black pepper Freshly ground

Instructions
 

  • Preheat the oven to 375°F (190°C). Unroll the pastry crust and press it gently into a 9-inch tart pan. Prick the bottom with a fork and chill in the refrigerator while preparing the filling.
  • Melt the butter in a large skillet over medium heat. Add the sliced onions and cook for 5-7 minutes until they begin to soften.
  • Add the sliced leeks to the skillet. Continue to cook for another 8-10 minutes, stirring occasionally, until both the leeks and onions are tender and lightly caramelized. Remove from heat and let cool slightly.
  • Spread the cooked leek and onion mixture evenly over the bottom of the prepared pastry crust.
  • Sprinkle the freshly grated Gruyere cheese over the leek and onion layer.
  • In a medium mixing bowl, whisk together the heavy cream, eggs, salt, and black pepper until smooth and well combined.
  • Carefully pour the egg and cream mixture over the vegetables and cheese in the tart shell.
  • Bake in the preheated oven for 35-40 minutes, or until the filling is set in the center and the top is a beautiful golden brown.
  • Remove the tart from the oven and allow it to cool in the pan for 10-15 minutes before slicing and serving.