manufactured in a cold-extraction process. The zest,oryellow part of the peel, is machine-pressed to squeeze out the scented oil. 1,500 lemons are needed to produce one pound (.45 kilograms) of essential oil. A type of lemon oil can also be made at home. For food flavoring and some homemade skin care products, the lemon zest can be heated in olive oil and strained,orleft in olive oil for several weeks to infuse it with lemon flavor. For homemade natural cleaning products and furniture polishes,