Pistachio Shortbread Sandwiches

Directions

• Cream butter and sugar until light and fluffy. Beat in vanilla. In another bowl, whisk flour and salt; gradually beat into creamed mixture. Stir in pistachios.
• Preheat oven to 300°. On a surface sprinkled with confectioners' sugar, roll dough to 1/4-in. thickness. Cut with a 2-1/2-in. fluted round cookie cutter dusted with confectioners' sugar. Place cookies 1 in. apart on ungreased baking sheets. Bake until edges begin to brown, 18-20 minutes. Cool on pans 5 minutes. Remove to wire racks to cool completely.
• Spread preserves on bottoms of half of the cookies; cover with remaining cookies. If desired, combine confectioners' sugar and lemon juice until smooth. Drizzle over cookies.