Instructions: Sprinkle roast with salt, pepper, and garlic salt. Place in a slow cooker. Top with sliced onion. Cover and cook on LOW 8 or 9 hours or until roast is tender. While roast is cooking, peel, pit, and mash avocado. Combine avocado, cilantro, lemon juice, chiles, Worcestershire sauce, and horseradish in a medium bowl. Cover and refrigerate.

Remove roast from slow cooker and slice. Arrange sliced roast on individual plates. Spoon onion and cooking juices over each serving and top with a dollop of avocado mixture.

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