In this demo, a zinc screw and copper penny are inserted into a lemon "battery" and a potential difference is measured via a voltmeter. The opposing chemical nature of zinc and copper immersed in the acidity of the lemon cause an electrochemical reaction, which results in a flow of current through the wires and voltmeter. Zinc is a better conductor than copper, thus the electrons head in the zinc screw's direction, as shown the the picture below. Remember, negatively charged electrons flow out the the negative end of the battery.
Courtesy of http://hilaroad.com/camp/projects/lemon/lemon_battery.html
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