LSBC/templates/podcast/_delete_form.html.twig

<form
  method="post"
  action="{{ path('app_podcast_delete', {'id': podcast.id}) }}"
  onsubmit="return confirm('Are you sure you want to delete this podcast?');"
>
  <input type="hidden" name="_token" value="{{ csrf_token('delete' ~ podcast.id) }}">
  <button class="btn btn-danger">Delete</button>
</form>