Season generously: Pat the beef roast dry with paper towels and season all sides with salt and pepper to your preference.
Add to slow cooker: Place the seasoned roast in the bottom of your slow cooker, then pour the entire jar of salsa over the top.
Set the cooking time: Cover and cook on low for 7-8 hours, or on high for 4-5 hours, until the meat shreds easily with a fork.
Shred the meat: Using two forks, pull the beef apart directly in the slow cooker until it reaches your desired texture.
Mix with sauce: Stir the shredded beef to evenly coat it with the salsa cooking liquid.
Serve: Transfer to a serving dish and top with your favorite garnishes like cilantro, sour cream, cheese, or jalapeños.
Choose your base: Serve over rice, in tortillas, over baked potatoes, or alongside Mexican street corn for a complete meal.