Ingredients

• All-purpose flour - 1 ½ cups
• Unsalted butter - ½ cup
• Granulated sugar - ¼ cup
• Egg yolks - 4
• Lemon juice - ½ cup
• Lemon zest - 1 tablespoon
• Cornstarch - 2 tablespoons
• Water - 1 cup
• Egg whites - 4
• Cream of tartar - ¼ teaspoon
• Additional granulated sugar for meringue - 1 cup

Instructions

1. 1.

   Preheat the oven to 350°F (175°C).

2. 2.

   In a mixing bowl, combine the flour and butter to form a dough. Press the dough into a tart pan and bake for 15 minutes until golden.

3. 3.

   In a saucepan, whisk together the egg yolks, sugar, lemon juice, lemon zest, cornstarch, and water. Cook over medium heat until thickened, stirring constantly.

4. 4.

   Pour the lemon filling into the baked tart shell and set aside.

5. 5.

   In a clean bowl, beat the egg whites and cream of tartar until soft peaks form. Gradually add sugar and continue beating until stiff peaks form.

6. 6.

   Spread the meringue over the lemon filling, making sure to seal the edges.

7. 7.

   Bake the tart in the oven for an additional 10-12 minutes until the meringue is lightly golden.

8. 8.

   Remove from oven and allow to cool before serving.