I am wrote a small object oriented code snippet based on u r code.

#!/usr/bin/perl
use warnings;
use strict;
use CGI qw/:standard/;
use CGI::Carp qw(warningsToBrowser fatalsToBrowser);
my $cgi=CGI->new();
print $cgi->header();
print $cgi->start_html();
my $value=$cgi->param('tapas');  ## No form check if possible 
print "Your favorite Tapas place in Barcelona was $value";
print $cgi->end_html();
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I haven't tested this, but should work

Also, In your code code snippet, print the header first then try to call param().