Lemon and Pistachio Praline Meringue Torte

INGREDIENTS

• 1 cup powdered sugar
• 3 tablespoons water
• 1/2 cup sugar
• 4 large egg whites
• 1/2 teaspoon almond extract
• 5 large egg whites
• 2 tablespoons fresh lemon juice
• 1/4 teaspoon cream of tartar
• 4 ounces good-quality white chocolate (such as Lindt or Baker's), chopped
• 1 cup (2 sticks) unsalted butter, room temperature
• 1 teaspoon vanilla extract
• 1 tablespoon light corn syrup
• 1 tablespoon plus 2 teaspoons grated lemon peel
• 1 cup shelled unsalted pistachios
• 3/4 cup sugar
• 1/2 teaspoon cream of tartar
• 2 tablespoons plus 2/3 cup sugar