Preheat oven to 350 degrees. In mixing bowl, cream sugar, shortening, and eggs; add vanilla and lemon extract. Stir in flour, baking soda, baking powder, and salt. Crush lemon drops in blender or food processor. Add lemon zest and crushed lemon drops. Roll into balls, flatten slightly with your hand, and bake on a parchment lined cookie sheet (You must use parchment here to avoid sticking).