Thinly slice one whole onion. You can add a second onion if your family enjoys onions or if you are using a larger roast.
In a crock pot, add the roast, ½ cup of soy sauce, 1 tbsp of garlic powder, and 3 tbsp of rice vinegar (or white vinegar)
Next, put the sliced onions on top of the roast and cover the crock pot. Set the crock pot on low for 6-8 hours. Timing may vary slightly depending on your crock pot. Beef is considered done when it has an internal temperature of 145 degrees according to the USDA.
When done, take the roast out of the crock pot and let rest for about 10 minutes before cutting.
Serve hot and with the liquid that the roast cooked in.
