public function fa($service, $url = null, array $options = [])
    {
        $defaults = [
            'target' => $this->_config['target']
        ];
        $options += $defaults;

        $options['escape'] = false;

        $icon = $this->icon($service, $options);
        unset($options['icon_class']);

        $attributes = $options;
        unset($attributes['text']);
        unset($attributes['image']);

        return $this->Html->link(
            $icon,
            $this->href($service, $url, $options),
            $attributes
        );
    }