Laravel display dynamic menu items on layout template

I have defined a Category model and table that I'm filling through the backend of my Laravel application. I want to display the categories as menu items.

In my controller, I have something like

public function index()
{
    $categories = Category::all();
    return view('layouts.app', ['categories' => $categories]);
}

So the idea is that I can loop in the layouts.app template over these categories.

 @foreach($categories as $category)
       <li><a href="..." class="user-icon"> </a></li>
 @endforeach

How can I make sure that my app displays these catagories on all pages (that use the layouts.app template). Normally one could create a route entry but how to do this for the layouts.app template?

via Chebli Mohamed