FestinHegre/templates/plats/_delete_form.html.twig

<form method="post" action="{{ path('app_plats_delete', {'id': plat.id}) }}" onsubmit="return confirm('Es-tu sur de vouloir le supprimer ?');">
    <input type="hidden" name="_token" value="{{ csrf_token('delete' ~ plat.id) }}">
    <button class="btn">Supprimer</button>
</form>