1Heat oven to 350°F. Dissolve coffee in water in medium bowl. Stir in butter and powdered sugar Stir in flour and 1/2 cup of the nuts, using hands if necessary, until stiff dough forms.
2Divide dough in half. Shape each half into a ball. Pat each ball into 6-inch round, about 1/2 inch thick, on lightly floured surface. Cut each round into 16 wedges Arrange wedges about 1/2 inch apart with pointed ends toward center on ungreased cookie sheet.
3Bake 12 to 15 minutes or until golden brown. Immediately remove from cookie sheet to wire rack. Cool completely, about 30 minutes.
4Place remaining 1/4 cup nuts in small dish Place white baking chips and shortening in small microwavable bowl Microwave uncovered on Medium (50%) 3 to 4 minutes, stirring after 2 minutes, until mixture can be stirred smooth and is thin enough to drizzle. Dip 1 edge of each cookie into melted mixture, then into nuts. Place on waxed paper until coating is firm.