I read it and understood; I just don't agree with your ideas about data structures for templating. I believe you should only nest your data structures when the data actually requires it, which is not the case here. If I were doing this, I would get rid of that top hashref and set it up like this:

 <p>Org id: [% org_id %]</p>
 <p>Org name: [% org_name %]</p>

 <p>Group id: [% group_id %]</p>
 <p>Group name: [% group_name %]</p>
[download]

I would only use another level below this if there are multiple values. For example, if there are multiple groups per organization, I would represent groups as an array of hashes, so I could make a template like this:

 <p>Org id: [% org_id %]</p>
 <p>Org name: [% org_name %]</p>

 [% FOREACH group = groups %]
   <p>Group id: [% group.id %]</p>
   <p>Group name: [% group.name %]</p>
 [% END %]
[download]