Cut the Roast in quarters, season with salt and pepper, and brown on all sides in a saucepan.
Transfer to slow cooker, add tamari, garlic, onion, Thai chilis, honey or stevia, bone beef broth, vinegar or lime juice, and sesame oil.
Cook on low for 8 hours.
Shred the beef in the juices.
Serve on lettuce topped with carrots, cucumbers, peppers, cilantro, radish, and green onion.