A spicy slow cooker barbacoa is, to us, the perfect beef option for taco night or for juicy shredded beef sandwiches. The smoky spiciness of chipotle peppers in adobo sauce just makes peoples mouths water without even taking a first bite This recipe is very similar to the barbacoa youd find at chipotle, the restaurant chain but with a lot more kick with the healthy portion of chipotles and the dash of cayenne to top things off. If youre concerned about too much spiciness, simply remove the cayenne and lower the amount of chipotles used from four to three. Its still spicy, but without the double down on heat.