How to get Clicked Button on Ember Controller

I can't get the clicked button on ember controller

I used deleteStudent : function(event) {} but event is undefined. I also tried deleteStudent : function() { console.log(this);} but 'this' refers to something else;

//HTML

<ul>
    
    <li id=>  <button >x</button></li>
    
</ul>

//Ember controller

actions: {
            deleteStudent : function() {
            console.log(); // I want to get button here
          }