Classic Lemon Tart

Preparation

1. Step 1

   Make the crust: In a small saucepan over medium heat, melt the butter. (If you like, you can let the butter cook until it browns and smells nutty, 2 to 4 minutes longer.)

2. Step 2

   Whisk together flour, confectioners’ sugar and salt in a medium bowl. Drizzle in melted butter and, using a spatula, mix until well combined. Press this into the bottom and up the sides of a 9-inch tart pan, using a measuring cup if you like to flatten the tart shell and make sure it’s even. Place in the freezer for at least 30 minutes and up to 2 months (wrap in plastic if storing for more than 4 hours).

3. Step 3

   Heat oven to 350 degrees. Line tart dough with a piece of foil or parchment paper and fill with pie weights, dry beans or rice. Bake for 15 minutes, then remove the foil and weights and continue to bake until the crust is very lightly golden at the edges and baked through on the bottom, 10 to 15 minutes longer. Transfer to a rack to cool. (Tart shell can be made up to 1 day ahead and kept at room temperature.)

4. Step 4

   Make the curd: Put butter, lemon zest, lemon juice and sugar in a heavy saucepan over medium heat. Cook until butter is melted and mixture is hot, 4 to 5 minutes.

5. Step 5

   In a medium bowl, beat together eggs, yolks and salt. Whisk the hot mixture gradually into the eggs to temper them. Then pour everything back into the saucepan and return to medium-low heat. Cook, whisking constantly, until mixture thickens enough to coat the back of a wooden spoon (170 degrees; do not overcook, or it will curdle), about 5 minutes. Pour through a fine-meshed sieve into a bowl. Taste and add a bit more sugar if you like. It should taste tart but balanced.

6. Step 6

   Spread the curd (it’s OK if it’s still warm) into the tart shell, spreading it evenly with a small offset spatula or butter knife. Return to the oven to bake until the curd is just set along the edges but still jiggly in the center, about 7 to 15 minutes. (It will continue to firm up as it cools.) Transfer back to the wire rack to cool completely, at least 2 hours, before serving. If the curd still looks a little loose after cooling, you can chill the tart for an hour or two before serving. Note that it’s a soft curd but shouldn’t be runny.