Combine first 6 ingredients in a large bowl; set aside.
Beat butter at medium speed with an electric mixer until creamy; gradually add 1 cup brown sugar, beating well. Add egg; beat until blended. Stir in molasses and lemon rind. Gradually stir in flour mixture until combined, stopping to scrape down sides. Cover and chill dough 2 hours.
Roll dough into 1/2" balls. Roll balls in turbinado sugar; place on a lightly greased baking sheet. Flatten to 1/4" thickness with a flat-bottomed glass.
Bake at 375° for 7 minutes. Cool on baking sheet 1 minute. Remove to wire racks to cool completely.