Dice avocado and toss with the lime juice in a small mixing bowl. Add the remaining ingredients and mash with a fork until well blended. Use a rubber spatula and scrape onto a piece of kitchen parchment or plastic wrap. Roll up and twist the the ends to form a cylinder. Refrigerate for 2 to 3 hours until firm. Remove parchment and slice to serve. Can be stored in the freezer for up to 1 month.
Recipe by Grilling Outdoor Recipes powered by Bull Outdoor Products at http://www.grillingoutdoorrecipes.com/coffee-rubbed-skirt-steaks-with-avocado-lime-butter/