Displaying categories and its items without category.php page

Hello,

I have a list and details page set up like your Portfolio with Categories example. I'm trying to display a list of categories and all the items within that category on one page (so not using a category.php page).

Eg:

Category 1 Title (from the category template)
Category 1 Description (from the category template)
Item A within Category 1
Item B within Category 1

Category 2 Title (from the category template)
Category 2 Description (from the category template)
Item A within Category 2
Item B within Category 2

I'm getting a bit stuck as the only examples I can find are using a category page and calling it from the slug.

This is what I have that I need to put together:

Getting the categories:

<?php perch_categories(); ?>

Getting the Items

                    <?php
                    perch_content_create('Products', array(
                         'template'   => 'product-detail.html',
                         'multiple'    => true,
                         'edit-mode' => 'listdetail',
                    ));

                    perch_content_custom('Products', array(
                         'template' => 'product-listing.html',
                         'category' => perch_get('cat'),
                    ));
                    ?>