Pineapple Macadamia Nut Meringue Pies

Name: Pineapple Macadamia Nut Meringue Pies
Ingredients: 3/4 cup salted macadamia nuts (about 3 ounces); 1 cup all-purpose flour; 2 tablespoons sugar; 1/4 teaspoon salt; 1/2 stick (1/4 cup) cold unsalted butter, cut into 1/2-inch cubes; 1 large egg, lightly beaten; 3 tablespoons unsalted butter; 2 1/4 cups diced (1/4 inch) cored peeled fresh pineapple (labeled extra sweet); 1/4 cup packed light brown sugar; 1 tablespoon fresh lemon juice; 2 large egg whites; 1/8 teaspoon cream of tartar; 1/4 cup sugar; 12 (2- to 2 1/2-inch) metal pie plates or a mini-muffin pan with 12 (1/8-cup) cups; an offset metal spatula