Smoked Salmon and Spring Vegetable Quiche Recipe

Name: Smoked Salmon and Spring Vegetable Quiche Recipe
Ingredients: 1 ¼ cups all-purpose flour; 1 teaspoon granulated sugar; ½ teaspoon + ⅛ teaspoon salt, divided; 8 tablespoons butter, chilled and cubed; ¼ cup very cold water; 2 tablespoons olive oil; 1 cup chopped leeks; 4 ounces smoked salmon, torn into pieces; ½ cup peas; 4 eggs; 2 cups heavy whipping cream; ¼ teaspoon pepper; 1 tablespoon chopped fresh dill, plus more for topping; ½ cup fresh mozzarella, torn to pieces; ½ cup crème fraîche; 1 teaspoon capers with juice; 1 teaspoon lemon juice