I found this recipe on TheFoodNetwork.com, demonstrated on some show years ago. They're pretty good. Be sure not to overbake them.
2 cups flour
4 tbsp sugar
1/8 tsp salt
1/2 cup butter PLUS 2 1/2 tbsp margarine
4 eggs, beaten
1 cup almonds, chopped
2 cups brown sugar
3 cups sweetened flaked coconut
1 1/2 cups pwd sugar
2 tbsp fresh lime juice
2 tsp (or more) lime zest
Combine the flour, sugar and salt in a bowl. Cut in the butter and margarine until the mixture resembles coarse meal. Press into an ungreased 10 x 15" jellyroll pan. Bake 350 degrees for 15 minutes, or until golden brown.
In a bowl, mix the eggs, nuts, brown sugar and coconut until well blended and spread over baked crust. Bake an additional 30 minutes, or until set. remove pan from the oven.
While the bars are still warm, loosen the edges with a metal spatula. Working quickly, spread the Lime Icing all over the top. It will be a very thin layer of icing. Let cool to room temperature, then cut into bars.