repository pattern x non matching business object

I understand well why and how to use a repository and the same applies to query objects, they all seem simple to understand as long as you need, for instance, objects that mirror exactly what is in the database.

But I can't seem to get my head around where exactly to fit the objects for a very specific structure I'm building right now.

I have products and categories, and they all have their repository.

My categories exist within a self-referencing parent-child structure.

I have products that belong to a categories that don't have child categories.

Now I need to pull this data to put together a menu which will be like this:

Data:

Kitchen (category) Cutlery (category Knives (category) 3-piece knives set (product) Spoons (category) 3-piece spoons set (product) Appliances Coffee-Making-Machines (category) Nespresso Machine (product) Espresso Machine (product Blenders (category) Smoothie Blender (product)

Then I need a menu, which will be like this:

Kitchen (this will be a link to see all its child categories) 3-piece knives set (this will a link directly to the product page) Nespresso Machine Smoothie Blender Another Category Another product 1 Another product 2 Another product 3

This will be a list of all top level categories in which the vendor has products in our marketplace, with a randomly selected list of products that are under that top level category regardless of the category level.

All fine, I got all that working. Now I'm just trying to understand where does this kind of structure fit in an architecture which has repositories that basically contain one object per table.

How do I match my repositories, which mirrors raw data into a totally different business object?

If someone could point me to a good article that tackle this problem, it would be great.