Step 1Heat the oven to 325 degrees.
Step 2In a large bowl, whisk together the eggs, water, sugar, flour, salt and butter. Fold in the coconut. Pour the filling into the unbaked pie shell, and top with a little extra coconut if desired to brown as the pie bakes.
Step 3Place the pie in the oven and bake until lightly golden and the custard is set (it will jiggle only slightly when tapped), 45 to 55 minutes, rotating halfway through baking. If the pie colors too quickly before it is set, loosely tent with foil.
Step 4Remove and cool before serving.