Preheat oven to 350ºF. In a food processor, finely grind the vanilla wafers. Add melted butter and ½ tablespoons lime peel and process until moist crumbs form. Transfer into a 9” pieplate and press crumbs, onto bottom and up sides. Crust will be thin. Bake for 10 minutes or until edges are golden brown. Remove from oven and set aside to cool.
Whisk condensed milk, lime juice and 1 tablespoon lime zest in a medium bowl to blend. Whisk in eggs. Pour filling into crust. Bake for 20 minutes or until filling is set. Cool. Refrigerate until chilled, about 1 hour.