1. In your food processor, add herbs and pulse until well chopped. Add butter in chunks, processing until fully mixed.
2. Lay out a long sheet of plastic wrap (about 12 inches), and scoop the butter into the center, making a somewhat log shape. Wrap the plastic wrap up on the sides, and then squeeze butter into log shape. Twist ends, place in freezer or fridge and use as desired.
I have had this in my friend for up to 2 weeks before we used it all, and it was still good. Use whatever herbs you have leftover!