I would use Template::Alloy's extensions to HTML::Template. It is much easier to access data and will probably run faster than using HTML::Template by itself.

#!/usr/bin/perl

use strict;
use warnings;
use Template::Alloy qw(HTML::Template);
use HTML::Template;

my $data = [
  [qw{one two three}],
  [qw{four five six}],
  [qw{seven eight nine}],
];

my $tmpl = do{local $/;<DATA>};
my $t = HTML::Template->new(scalarref => \$tmpl) or die qq{tmpl obj fa
+iled\n};
$t->param({data => $data});
print $t->output;

__DATA__
<TMPL_FOR row IN data>
---------------------------
  <TMPL_FOR i IN row>
    <TMPL_VAR i>
  </TMPL_FOR>
</TMPL_FOR>
[download]

The output will be same as the previous post.