function recipes_post_link( $post_link, $id = 0 ){
    $post = get_post( $id );
    if ( is_object( $post ) ){
        //$terms = wp_get_object_terms( $post->ID, 'recipe-category' );
        $terms = get_the_terms( $post->ID, 'recipe-category' );
        //echo '<pre>' . var_dump($terms) . '</pre>';
        foreach($terms as $term) {
            if( $term->slug == 'ristorante' || $term->slug == 'utenti'){
                //var_dump($post_link);
                //var_dump($term->slug);
                return str_replace( site_url()."/ricetta" , site_url()."/ricetta/".$term->slug , $post_link );
            }
        }
    }
    return $post_link;
}
add_filter( 'post_type_link', 'recipes_post_link', 1, 3 );

function custom_rewrite_basic() {
  add_rewrite_rule('^ricetta/(.+)/(.+)', 'index.php?recipe=$matches[2]', 'top');
}
add_action('init', 'custom_rewrite_basic');