JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = [['apple', 'orange', 'banana', 'pear', 'fish', 'pancake', 'taco', 'pizza'],
        ['taco', 'fish', 'apple', 'pizza'],
        ['banana', 'pizza', 'fish', 'apple']]

var tmp = {};
for (i = 0; i < data.length; i++) {
    for (j = 0; j < data[i].length; j++) {
        if (!tmp[data[i][j]]) {
            tmp[data[i][j]] = 0;
        }
        tmp[data[i][j]]++;
    }
}

var results = $.map(tmp, function(val,key) {
    return val == data.length ? key :null;
})

$('body').html(results.toString())