Preheat oven to 350 degrees. Line baking sheets with parchment paper.
In a large bowl stir together the flour, coconut and salt. Mix in the lime zest, vanilla, lime juice, and sweetened condensed milk.
Using a small cookie scoop, scoop the cookies out onto the parchement paper lined sheets. Bake for 12 to 15 minutes or until the cookies just begin to turn golden brown.
After the cookies have cooled, melt the white chocolate according to package instructions. Dip the bottoms of the macaroons in the chocolate. Drizzle the remaining chocolate on top and sprinkle a bit more lime zest on each one.
Store in an airtight container for up to two weeks or follow the freezing instructions in the post.