Having just needed something along these lines, and after reading through the Dreaming of Post Interpolation thread, I think I've settled on using something like this: 
@lines = <<TEXT_INFO;
  Dear \$person,
  I know that this text is \$adjective.
  But I wish it could be...

  This is a test of imbedded variables
  I want to set \\\$variable later, and then have it interepreted when
+ printed
  variable was set to \$variable
TEXT_INFO

$variable = 5;
my $person    = 'Mom';
my $adjective = 'not interpolated';

foreach $line (@lines) {
    print eval "qq{$line}";
}

[download]
-Scott

In reply to Re: Double Interpolation of a String by 5mi11er
in thread Double Interpolation of a String by chromatic

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