1. In medium-sized bowl, knead first 6 ingredients until well mixed (dough will be stiff).
2. Preheat oven to 350°F. Shape 1 teaspoonful cookie dough around a macadamia nut; roll into a ball. Repeat with remaining dough and nuts, placing cookies, 1 inch apart, on ungreased cookie sheets.
3. Bake cookies 10 minutes or until lightly golden. Remove cookies to wire racks to cool.
4. Meanwhile, in heavy, 1-quart saucepan over low heat, melt chocolate pieces and shortening. When cookies are cold, with spoon, drizzle chocolate mixture over cookies. Allow chocolate to dry. (Refrigerate cookies if necessary.) Store cookies in tightly covered container.