lemon bar recipe

### Ingredients: **Crust:** - 1 cup (2 sticks) unsalted butter, softened - 1/2 cup granulated sugar - 2 cups all-purpose flour - 1/4 teaspoon salt **Filling:** - 4 large eggs - 1 1/2 cups granulated sugar - 1/4 cup all-purpose flour - 2/3 cup freshly squeezed lemon juice (about 3-4 lemons) - Zest of 2 lemons