Prep: 20 min + chilling. Bake: 10 min/batch. Makes: About 4 1/2 dozen
3/4 cup butter, softened
1 cup sugar
1 large egg
1 tablespoon grated orange peel
1 teaspoon vanilla extract
2 cups all-purpose flour
1/4 cup cornstarch
1/2 cup pistachios, roasted and finely chopped
For the icing...
2 1/4 cups confectioners' sugar
1/4 cup orange juice
1 tablespoon butter, melted
Additional pistachios, roasted and finely chopped, optional
In a large bowl, cream butter and sugar until light and fluffy. Beat in egg,orange peel and vanilla. In another bowl, whisk flour and cornstarch; gradually beat into creamed mixture. Divide dough in half. Roughly shape each portion into a 7-inch roll along the long end of a 14x8-inch sheet of waxed paper. Tightly roll waxed paper over dough, using the waxed paper to mold the dough into a smooth roll. Securely wrap waxed paper-covered roll in plastic wrap; freeze 30 minutes or until firm, or refrigerate overnight. Preheat oven to 350*. Place the pistachios in a shallow bowl. Unwrap and roll each roll of dough in pistachios. Cut dough crosswise into 1/4-inch slices. Place slices 1/2 inch apart onto parchment paper-lined baking sheets. Bake for 6-8 minutes or until bottoms are light brown. Cool slightly on pan. Transfer to wire racks to cool completely.
In a small bowl, combine confectioners' sugar, orange juice and butter until smooth. Spread over cookies. Sprinkle with pistachios if desired. Let stand until set.
To toast nuts, bake in a shallow pan in a 350* oven for 5-10 minutes or cook in a skillet over low heat until lightly browned, stirring occasionally.