Make my links open in a new tab/window

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PHP

I have a CMS that I need to modify. I want the external links to open in a new window target="_blank"

Heres the code:

<?php foreach ($this->menus as $menu) { ?>
<a href="<?php echo $menu->type == 'External' ? $menu->link : "/Index/Content/Id/{$menu->id}" ?>">

What I have tried:

<?php echo ($menu->type == 'External') ? "{$menu->link} target=_blank" : "/Index/Content/Id/{$menu->id}" ?>