Directions for crust:
Preheat oven to 350 degrees F.
Brush a 9 x 13-inch baking dish with melted butter; line bottom with parchment paper, leaving a 2-inch overhang on 2 sides.
In a food processor, finely grind pecans with coconut, graham cracker crumbs, sugar, and lime zest; blend in butter; press mixture into bottom and 1-inch up sides of prepared pan; bake until lightly browned, 8 to 12 minutes; cool crust for about 30 minutes.
Directions for filling:
In a large bowl, whisk together egg yolks and condensed milk; add lime juice and whisk until smooth; pour filling into cooled crust, carefully spread to edges.
Bake until just set, about 15 to 20 minutes; cool in pan, then chill at least 1 hour before serving.
Using parchment paper overhang, lift out of pan and transfer to cutting board; with a serrated knife, cut into squares.