Add the 0. 25 cup (0. 2 oz / 5 g) of chopped fresh mint leaves and your precise measurement of chosen citrus flavoring to the food processor bowl.
Process the ingredients on medium speed until the Mint-Lime Butter is completely fluffy and the mint leaves are finely chopped and evenly distributed throughout.
Transfer the finished butter to a well-sealed container, where it can be kept refrigerated for 1 to 2 weeks or safely frozen for up to 3 months.
Zest Before You Juice: If you are using fresh limes for both the zest and the juice, always zest the fruit first. Trying to grate a squeezed lime half is messy and yields less zest.
Shape and Freeze: For easy use over time, place the finished butter on a piece of parchment paper, roll it into a tight log, and twist the ends. You can keep this in the freezer and slice off perfect coins of Mint-Lime Butter as needed for your meals.