Your template uses a loop to build the list so your parameter list needs an entry for the loop containing a list of the name/value pairs used to populate the list entries. Consider:

#!/usr/bin/perl
use strict;
use warnings;
use HTML::Template;

my $html = <<HTML;
<DIV CLASS='menu_bar'><tmpl_if name=menu_options>
    <UL CLASS='main_menu'> <tmpl_loop name=menu_options>
        <LI CLASS='main_menu'>
           <A CLASS='main_menu' HREF='<tmpl_var name=option_address>'>
+<tmpl_var name=option_name></A>
        </LI></tmpl_loop>
    </UL></tmpl_if>
</div>
HTML
my @options = ("Home", "About", "Contact",);
my %options_menu = (
    Home    => '/index.cgi',
    About   => '/about.cgi',
    Contact => 'contact.cgi',
);

my $tmpl = HTML::Template->new (
    path      => ['/path/to/'],
    scalarref => \$html,
);
my %params;

push @{$params{menu_options}},
    {option_name => $_, option_address => $options_menu{$_}}
    for @options;

$tmpl->param (%params);
print $tmpl->output ();
[download]

Prints:

<DIV CLASS='menu_bar'>
    <UL CLASS='main_menu'> 
        <LI CLASS='main_menu'>
           <A CLASS='main_menu' HREF='/index.cgi'>Home</A>
        </LI>
        <LI CLASS='main_menu'>
           <A CLASS='main_menu' HREF='/about.cgi'>About</A>
        </LI>
        <LI CLASS='main_menu'>
           <A CLASS='main_menu' HREF='contact.cgi'>Contact</A>
        </LI>
    </UL>
</div>
[download]

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