How to get the event target?

secureAuraEventTest.cmp

<aura:component>
    <aura:attribute name="data" type="List"/>
    <aura:handler name="init" action="{!c.initHandler}" value="{!this}"/>
    <aura:iteration items="{!v.data}" var="dataRow">
        <li>
            <a onclick="{!c.iterationHandler}" data-object="{!dataRow.stringified}">Item {!dataRow.Name}</a>
        </li>
    </aura:iteration>
</aura:component>

secureAuraEventTestController.js

({
    initHandler: function(cmp) {
        var data = [
            {'stringified': '{}', 'Name': 'Red Sox'},
            {'stringified': 'true', 'Name': 'White Sox'},
            {'stringified': '"foo"', 'Name': 'Giants'},
            {'stringified': '[1, 5, "false"]', 'Name': 'Yankees'}
            ];
        cmp.set('v.data', data);
    },

    iterationHandler: function(cmp, event) {
        var valueObject = JSON.parse(event.target.getAttribute('data-object'));
        console.log(valueObject);
    }
})

This is still not working :/

Indeed!