lemon bars

INGREDIENTS

• 1/2 pound unsalted butter, at room temperature
• 1/2 cup granulated sugar
• 2 cups flour
• 1/8 teaspoon kosher salt
• 6 extra-large eggs at room temperature
• 2 1/2 cups granulated sugar
• 2 tablespoons grated lemon zest (4 to 6 lemons)
• 1 cup freshly squeezed lemon juice
• 1 cup flour
• 4 extra-large eggs at room temperature
• 1 2/3 cups granulated sugar
• 1 tablespoon + 1 teaspoon grated lemon zest (3 to 4 lemons)
• 2/3 cup freshly squeezed lemon juice
• 2/3 cup flour