Laravel 5.2 named route usage with variable parameter

Happy new year!

I have a route like this:

// Open New Subscription page
Route::get('/account/subscriptions/create/{menu}', ['uses' => 'Subscriptions\SubscriptionController@create', 'as' => 'subscription.create']);

In my blade template I use the named route like this:

<a href="{!! route('organisations.index') . "/p11-c3" !!}">

But this format does not work.

How do I pass the variable menu a value while still using the named route (rather than hard coding a url in the href)?

via Chebli Mohamed