Step 1

Combine flour and salt in small bowl.Beat buttersugarlemon peel and vanilla extract in large mixer bowl until fluffy.Gradually beat in flour mixture. Stir in 1 cup morsels.

Step 2

Divide dough into 4 even pieces. Gently shape each piece into an 8 x 1-inch diameter log.Wrap logs tightly in wax paper.Refrigerate for at least 1 hour or until firm.

Step 3

Preheat oven to 350° F.

Step 4

Unwrap logs; cut each log with serrated knife into 16 slicesabout 1/2-inch thick.If necessaryreshape edges of cookies.Place 2 inches apart onto ungreased baking sheets.

Step 5

Bake for 13 to 14 minutes or until edges are set.Cool for 2 minutes; remove to wire racks to cool completely.

Step 6

Line baking sheet with wax paper.

Step 7

Microwave remaining 1 cup morsels and vegetable shortening in smalluncoveredmicrowave-safe bowl on MEDIUM-HIGH (70%) power for 1 minute;STIR.Morsels may retain some of their original shape.If necessarymicrowave at additional 10- to 15-second intervalsstirring just until morsels are melted.

Step 8

Dip top half of cookies into melted morsels.Scrape off excess against side of bowl.Place on baking sheets. Refrigerate for 20 minutes or until set.