For the Coconut Crust:
Preheat oven to 350°F (175°C). Grease an 8×8-inch square baking dish or line with parchment paper. In a bowl, combine flour, shredded coconut, sugar, and salt. Add cold butter and use a pastry cutter to work the butter into the dry ingredients until it resembles coarse crumbs. Press the mixture into the bottom of the prepared dish and bake for 15-18 minutes, until golden. Let cool.

1. For the Lime Filling:
   In a medium bowl, whisk together eggs, sugar, lime zest, lime juice, flour, and salt until smooth. Pour over the warm crust and bake for 18-20 minutes, or until the filling is set. Sprinkle with shredded coconut and bake for an additional 5 minutes, until coconut is toasted.
2. Cool and Serve:
   Allow the bars to cool at room temperature, then refrigerate for at least 2 hours. Cut into squares and garnish with extra lime zest or coconut before serving.