Slice onion into thin slices and place in the bottom of your slow cooker
Trim excess fat off beef roast, place beef on top of onions
Mix brown sugar, garlic, rice wine vinegar,sriracha, ginger, and sesame oil together
Rub mixture all over the beef roast
Sprinkle with salt & pepper to taste
Cover cooker and cook on high for 3-4 hours or on low for 6-8 hours (or until the meat falls apart easily with a fork)
When the meat is done cooking, remove from cooker, place on a cutting board and shred
Mix corn starch and water together, pour into liquid in the cooker and combine
Place shredded meat back into cooker, stir to cover with sauce, cover and cook for 10 more minutes
Assemble tacos with cheese, cabbage, tomato,onion and cilantro. Enjoy!
