Three simple ingredients make one helluva sandwich. And while we could just tell you to up the ante by topping it with a fried egg or throwing on some avocado, we’ve got a better idea: Upgrade the whole thing. We swap bacon for pancetta, lettuce for escarole, plain tomato for balsamic-roasted and white bread for sourdough. Even the mayonnaise gets a boost from a touch of cr,me fra,che and vinegar. Best of all, you’ll whip up this fancified version in no time.