POST http://ift.tt/2wdEkFm 419 (unknown status) - (can't post data in Laravel)

I'm trying to make a DOM event where user's clicking a table row's header (th) cell will delete the corresponding row from the database (that supplies the table's data). This code worked as intended framework-less, by just POST'ing an AJAX containing the row's id info from index.php to delete.php which then ran an sql query.

However, after moving the site to Laravel I ran into an error:

POST http://ift.tt/2wdEkFm 419 (unknown status)

The javascript piece responsible for attaching the delete event and posting the id through AJAX:

    function attachDelete() {
        $("#mainTable tbody tr th").on("click", function(e){
            console.log(e.target.innerText + " was clicked");
            var token = $('meta[name="csrf-token"]').attr('content');
            var id_to_delete = e.target.innerText;
            $.ajax({
                headers: { 'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')},
                type: 'POST',
                dataType: 'text',
                url: 'delete',
                data: { 
                    'id_to_delete': id_to_delete,
                    "_method": 'POST',
                    "_token": token 
                },
                success: function () {alert("Deleted!"); },
                failure: function() {alert("Error!");}
            });
        });
    }
    attachDelete();

The console.log(e.target.innerText + " was clicked"); goes off. However, the success / error messages do not appear. Going to http://ift.tt/2wdEkFm directly brings up a Laravel error window with lots of text, and this part highlighted:

 protected function methodNotAllowed(array $others)
    {
        throw new MethodNotAllowedHttpException($others);
    }

I've added the token variables after reading answers to related questions on stackoverflow, this didn't help, however.

In case it matters, the route:

Route::post('/delete', 'TasksController@delete');

The controller :

class TaskController extends Controller
{
public function delete() 
    {
        include 'config.php';

        $stmt = $pdo->prepare('DELETE FROM food WHERE id = :id');
        $stmt->execute(['id' => $_POST['id_to_delete']]);
    }

}

(code inside delete() used to just be the contents of a delete.php file in the old, framework-less site, where everything worked)

I've tried doing it without the controller by creating a delete.php view (with the same code as the delete() function), it didn't make a difference though:

Route::post('/delete', function () {
    return view('delete');
});

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