Ok. I'm assuming you already know that the only value that this script will allow on the cookie is test. Since you are using CGI.pm's textfield method, it gets the values that were submitted. If you prefer to use your default value, you must use -override or -force. In other words, change your textfield call to:
textfield(-name=>"flavor",-default=>$tasty,-override=>1)
As for this pass bit, you need to edit your copy of CGI.pm. In CGI 3.01, on line 556 there's a comment about cake and eating it too. This will instruct you to uncomment line 559. Once you do that, param() can read parameters submitted from both the query string and STDIN. Oh yeah, you also submit the parameter as who, not pass. The value should be pass. I hope this helps.
UPDATE: Realized you used url_param instead of param thus negating the need to edit CGI.pm. However remember the order of verification: check the cookie, failing that check params, failing that display the default page.
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