This is a lime. Used for drinks. I like to use mine for gin and tonics. But you have many options for this citrusy fruit.
Cut both ends off
Cut straight down the middle
Cut into lime halfway through the "flesh" running the longways . This will allow slices of lime to pinch your glass.
Cut slices. Any width you like.
And you are done. Tip: Enhance your beverage by running the lime all the way around the rim of the glass. .