Ingredients

  • 1 sheet frozen puff pastry (half of 17.3-ounce package), thawed
  • 2 tablespoons butter
  • 3 large leeks (white and pale green parts only), coarsely chopped
  • 1 teaspoon dried thyme
  • 1/2 bunch Swiss chard, ribs removed, leaves chopped (about 2 1/2 cups)
  • 1 1/4 cups whipping cream
  • 3 large eggs
  • 2 large egg yolks
  • 1 teaspoon salt
  • 1/4 teaspoon ground black pepper
  • Pinch of ground nutmeg

Method

  • Roll out pastry on floured work surface to 12-inch square.
  • Transfer to 9-inch-diameter glass pie dish.
  • Trim overhang to 1 inch.
  • Fold under; crimp edges.
  • Cover; chill.
  • Melt butter in large nonstick skillet over medium-low heat.
  • Add leeks and thyme.
  • Sprinkle with salt and pepper.
  • Cover; cook until leeks are very tender but not brown, stirring often, about 10 minutes.
  • Add chard; saut until wilted, about 2 minutes.
  • Remove from heat; cool.
  • Position rack in bottom third of oven; preheat to 425F.
  • Whisk cream and next 5 ingredients in large bowl.
  • Mix in cooled leek mixture.
  • Pour filling into crust.
  • Bake tart 15 minutes.
  • Reduce heat to 350F and bake until filling is puffed and just set in center, about 15 minutes longer.
  • Transfer to rack; cool 10 minutes.