use 5.010;
use Template;

my $t = Template->new;

my $document_template = <<'EOT';
[% FOR item IN rows.keys %]
%% Item [% loop.count %] of [% loop.size %]
\multirow{1}{0.85in}{\mytabhead{[% item %]}} & \mytabhead{[% rows.$item.Description %]} & [% rows.$item.Type %]  \hline
[% END %]
EOT

my $output_text = q{};
my $context = {};
$context->{rows} = \%hash; # from your original data
$t->process( \$document_template, $context, \$output_text ) 
  or die qq{Template error: }, $t->error, qq{\n};
say $output_text;