Prep fruits and vegetables including cleaning, peeling and cutting. Produce, bottle and label fresh juices. Properly package, weigh, and label to go meals according to weights-and-measures standards. A juicer, also known as a juice extractor, is a tool used to extract juice from fruits, herbs, leafy greens and other types of vegetables in a process called juicing. It crushes, grinds, and/or squeezes the juice out of the pulp.