Back Forty Beer Peanut Butter Porter is an Imperial Porter by style. It's creamy, it's big, it's just what it sounds like. Brewed with crushed peanuts and a malt bill thick enough to slather on some bread. Peanut Butter Porter belongs on your grocery list right next to the jelly, bananas & bacon. This craft beer is 10.5% ABV. In this craft beer review, we will take a look at the color, smell, and taste.