Trying to build a chef template that enumerates directories from an array

chef template array

directories:
<% @node[:app][:directories].each do |d| %>
    - <% d %>
<% end %>

Whereas node[:app][:directories] is an array that currently has six entries...

default[:app][:directories] = [ "/data/a/", "/data/b/", "/data/c/", "/data/d/", "/data/e/", "/data/f/" ]

Compiled, the template ends up like this: 

directories:
    - 
    - 
    - 
    - 
    - 
    - 

What am I doing wrong?

directories:
<% @node[:app][:directories].each do |d| %>
    - <%= d %>
<% end %>