Orange Almond Marshmallows

Name: Orange Almond Marshmallows
Ingredients: 2 cups sliced natural almonds; 1 1/2 teaspoons cornstarch; 1 1/2 teaspoons confectioners' sugar; Melted or softened butter, for brushing pan; 2 packages (about 1 1/2 tablespoons) unflavored gelatin; 1/3 cup fresh orange juice, strained; 3 large egg whites, at room temperature; 1 1/4 cups granulated sugar; 2 tablespoons light corn syrup; 1/8 teaspoon salt; 1 teaspoon pure vanilla extract or 1 vanilla bean, split and scraped; 1 tablespoon finely grated orange zest