Place the herbs of choice, lemon zest and juice, and butter in a small mixing bowl and beat with a wooden spoon until light and fluffy. Alternatively, you can do the beating in a mixer or food processor.
Lay a 12-inch-square piece of plastic wrap or parchment paper on your work surface and mound the flavored butter in the center.
Roll it up into a cylinder, twisting the ends to compact the butter. Chill the butter in the refrigerator or freezer until firm.
The flavored butter will keep for up to 14 days in the refrigerator or up to 12 months in the freezer. To use, unwrap the roll and cut crosswise into ½-inch slices.
